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收藏丨Python入门学习100道练习题,强烈推荐!
实例001:数字组合
total=0
for i in range(1,5):
for j in range(1,5):
for k in range(1,5):
if ((i!=j)and(j!=k)and(k!=i)):
print(i,j,k)
total+=1
print(total)
import itertoolssum2=0a=[1,2,3,4]for i in itertools.permutations(a,3): print(i) sum2+=1print(sum2)
实例002:“个税计算”
profit=int(input('Show me the money: '))
bonus=0
thresholds=[100000,100000,200000,200000,400000]
rates=[0.1,0.075,0.05,0.03,0.015,0.01]
for i in range(len(thresholds)):
if profit<=thresholds[i]:
bonus+=profit*rates[i]
profit=0
break
else:
bonus+=thresholds[i]*rates[i]
profit-=thresholds[i]
bonus+=profit*rates[-1]
print(bonus)
实例003:完全平方数
n=0
while (n+1)**2-n*n<=168:
n+=1
print(n+1)
n=0
while (n+1)**2-n*n<=168:
n+=1
for i in range((n+1)**2):
if i**0.5==int(i**0.5) and (i+168)**0.5==int((i+168)**0.5):
print(i-100)
实例004:这天第几天
def isLeapYear(y):
return (y%400==0 or (y%4==0 and y%100!=0))
DofM=[0,31,28,31,30,31,30,31,31,30,31,30]
res=0
year=int(input('Year:'))
month=int(input('Month:'))
day=int(input('day:'))
if isLeapYear(year):
DofM[2]+=1
for i in range(month):
res+=DofM[i]
print(res+day)
实例005:三数排序
raw=[]for i in range(3): x=int(input('int%d: '%(i))) raw.append(x)for i in range(len(raw)): for j in range(i,len(raw)): if raw[i]>raw[j]: raw[i],raw[j]=raw[j],raw[i]print(raw)raw2=[]for i in range(3): x=int(input('int%d: '%(i))) raw2.append(x)print(sorted(raw2))
实例006:斐波那契数列
def Fib(n):
return 1 if n<=2 else Fib(n-1)+Fib(n-2)
print(Fib(int(input())))
朴素实现
target=int(input())
res=0
a,b=1,1
for i in range(target-1):
a,b=b,a+b
print(a)
实例007:copy
import copya = [1,2,3,4,['a','b']]b = a # 赋值c = a[:] # 浅拷贝d = copy.copy(a) # 浅拷贝e = copy.deepcopy(a) # 深拷贝a.append(5)a[4].append('c')print('a=',a)print('b=',b)print('c=',c)print('d=',d)print('e=',e)
============ RESTART: F:\PyWorkspace\Python100\100examples\007.py ============
a= [1, 2, 3, 4, ['a', 'b', 'c'], 5]
b= [1, 2, 3, 4, ['a', 'b', 'c'], 5]
c= [1, 2, 3, 4, ['a', 'b', 'c']]
d= [1, 2, 3, 4, ['a', 'b', 'c']]
e= [1, 2, 3, 4, ['a', 'b']]
实例008:九九乘法表
for i in range(1,10):
for j in range(1,i+1):
print('%d*%d=%2ld '%(i,j,i*j),end='')
print()
实例009:暂停一秒输出
import time
for i in range(4):
print(str(int(time.time()))[-2:])
time.sleep(1)
实例010:给人看的时间
import timefor i in range(4): print(time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))) time.sleep(1)
实例011:养兔子
month=int(input('繁殖几个月?:'))month_1=1month_2=0month_3=0month_elder=0for i in range(month): month_1,month_2,month_3,month_elder=month_elder+month_3,month_1,month_2,month_elder+month_3 print('第%d个月共'%(i+1),month_1+month_2+month_3+month_elder,'对兔子') print('其中1月兔:',month_1) print('其中2月兔:',month_2) print('其中3月兔:',month_3) print('其中成年兔:',month_elder)
实例012:100到200的素数
import math
for i in range(100,200):
flag=0
for j in range(2,round(math.sqrt(i))+1):
if i%j==0:
flag=1
break
if flag:
continue
print(i)
print('\nSimplify the code with "else"\n')
for i in range(100,200):
for j in range(2,round(math.sqrt(i))+1):
if i%j==0:
break
else:
print(i)
实例013:所有水仙花数
for i in range(100,1000):
s=str(i)
one=int(s[-1])
ten=int(s[-2])
hun=int(s[-3])
if i == one**3+ten**3+hun**3:
print(i)
实例014:分解质因数
target=int(input('输入一个整数:'))
print(target,'= ',end='')
if target<0:
target=abs(target)
print('-1*',end='')
flag=0
if target<=1:
print(target)
flag=1
while True:
if flag:
break
for i in range(2,int(target+1)):
if target%i==0:
print("%d"%i,end='')
if target==i:
flag=1
break
print('*',end='')
target/=i
break
实例015:分数归档
points=int(input('输入分数:'))
if points>=90:
grade='A'
elif points<60:
grade='C'
else:
grade='B'
print(grade)
实例016:输出日期
import datetime
print(datetime.date.today())
print(datetime.date(2333,2,3))
print(datetime.date.today().strftime('%d/%m/%Y'))
day=datetime.date(1111,2,3)
day=day.replace(year=day.year+22)
print(day)
实例017:字符串构成
string=input("输入字符串:")alp=0num=0spa=0oth=0for i in range(len(string)):if string[i].isspace(): spa+=1 elif string[i].isdigit(): num+=1 elif string[i].isalpha(): alp+=1else: oth+=1print('space: ',spa)print('digit: ',num)print('alpha: ',alp)print('other: ',oth)
实例018:复读机相加
a=input('被加数字:')
n=int(input('加几次?:'))
res=0
for i in range(n):
res+=int(a)
a+=a[0]
print('结果是:',res)
实例019:完数
def factor(num): target=int(num) res=set()for i in range(1,num):if num%i==0: res.add(i) res.add(num/i)return resfor i in range(2,1001):if i==sum(factor(i))-i: print(i)
实例020:高空抛物
high=200.total=100for i in range(10): high/=2 total+=high print(high/2)print('总长:',total)
实例021:猴子偷桃
peach=1for i in range(9): peach=(peach+1)*2print(peach)
实例022:比赛对手
a=set(['x','y','z'])
b=set(['x','y','z'])
c=set(['x','y','z'])
c-=set(('x','y'))
a-=set('x')
for i in a:
for j in b:
for k in c:
if len(set((i,j,k)))==3:
print('a:%s,b:%s,c:%s'%(i,j,k))
实例023:画菱形
def draw(num):
a="*"*(2*(4-num)+1)
print(a.center(9,' '))
if num!=1:
draw(num-1)
print(a.center(9,' '))
draw(4)
实例024:斐波那契数列II
a = 2.0
b = 1.0
s = 0
for n in range(1,21):
s += a / b
a,b = a + b,a
print (s)
实例025:阶乘求和
res=1for i in range(20,1,-1): res=i*res+1print(res)
实例026:递归求阶乘
def factorial(n):return n*factorial(n-1) if n>1 else 1print(factorial(5))
实例027:递归输出
def rec(string):if len(string)!=1: rec(string[1:])print(string[0],end='')rec(input('string here:'))
实例028:递归求等差数列
def age(n):if n==1:return 10return 2+age(n-1)print(age(5))
实例029:反向输出
n=int(input('输入一个正整数:'))
n=str(n)
print('%d位数'%len(n))
print(n[::-1])
实例030:回文数
n=input("随便你输入啥啦:")a=0b=len(n)-1flag=Truewhile a<b:if n[a]!=n[b]:print('不是回文串') flag=Falsebreak a,b=a+1,b-1if flag:print('是回文串')
实例031:字母识词
weekT={'h':'thursday',
'u':'tuesday'}
weekS={'a':'saturday',
'u':'sunday'}
week={'t':weekT,
's':weekS,
'm':'monday',
'w':'wensday',
'f':'friday'}
a=week[str(input('请输入第一位字母:')).lower()]
if a==weekT or a==weekS:
print(a[str(input('请输入第二位字母:')).lower()])
else:
print(a)
实例032:反向输出II
a = ['one', 'two', 'three']
print(a[::-1])
实例033:列表转字符串
L = [1,2,3,4,5]print(','.join(str(n) for n in L))
实例034:调用函数
def hello():
print('Hello World!')
def helloAgain():
for i in range(2):
hello()
if __name__=='__main__':
helloAgain()
实例035:设置输出颜色
class bcolors: HEADER = '\033[95m' OKBLUE = '\033[94m' OKGREEN = '\033[92m' WARNING = '\033[93m' FAIL = '\033[91m' ENDC = '\033[0m' BOLD = '\033[1m' UNDERLINE = '\033[4m'print(bcolors.WARNING + "警告的颜色字体?" + bcolors.ENDC)
实例036:算素数
lo=int(input('下限:'))
hi=int(input('上限:'))
for i in range(lo,hi+1):
if i > 1:
for j in range(2,i):
if (i % j) == 0:
break
else:
print(i)
实例037:排序
raw=[]
for i in range(10):
x=int(input('int%d: '%(i)))
raw.append(x)
for i in range(len(raw)):
for j in range(i,len(raw)):
if raw[i]>raw[j]:
raw[i],raw[j]=raw[j],raw[i]
print(raw)
实例038:矩阵对角线之和
mat=[[1,2,3], [3,4,5], [4,5,6] ]res=0for i in range(len(mat)): res+=mat[i][i]print(res)
实例039:有序列表插入元素
lis=[1,10,100,1000,10000,100000]n=int(input('insert a number: '))lis.append(n)for i in range(len(lis)-1): if lis[i]>=n: for j in range(i,len(lis)): lis[j],lis[-1]=lis[-1],lis[j] breakprint(lis)
实例040:逆序列表
lis=[1,10,100,1000,10000,100000]
for i in range(int(len(lis)/2)):
lis[i],lis[len(lis)-1-i]=lis[len(lis)-1-i],lis[i]
print('第一种实现:')
print(lis)
lis=[1,10,100,1000,10000,100000]
print('第二种实现:')
lis.reverse()
print(lis)
实例041:类的方法与变量
def dummy():
i=0
print(i)
i+=1
class cls:
i=0
def dummy(self):
print(self.i)
self.i+=1
a=cls()
for i in range(50):
dummy()
a.dummy()
实例042:变量作用域
i=0
n=0
def dummy():
i=0
print(i)
i+=1
def dummy2():
global n
print(n)
n+=1
print('函数内部的同名变量')
for j in range(20):
print(i)
dummy()
i+=1
print('global声明同名变量')
for k in range(20):
print(n)
dummy2()
n+=10
实例043:作用域、类的方法与变量
class dummy:
num=1
def Num(self):
print('class dummy num:',self.num)
print('global num: ',num)
self.num+=1
n=dummy()
num=1
for i in range(5):
num*=10
n.Num()
实例044:矩阵相加
X = [[12,7,3],
[4 ,5,6],
[7 ,8,9]]
Y = [[5,8,1],
[6,7,3],
[4,5,9]]
res=[[0,0,0],
[0,0,0],
[0,0,0]]
for i in range(len(res)):
for j in range(len(res[0])):
res[i][j]=X[i][j]+Y[i][j]
print(res)
实例045:求和
res=0
for i in range(1,101):
res+=i
print(res)
实例046:打破循环
while True: try: n=float(input('输入一个数字:')) except: print('输入错误') continue dn=n**2 print('其平方为:',dn) if dn<50: print('平方小于50,退出') break
实例047:函数交换变量
def exc(a,b): return (b,a)a=0b=10a,b=exc(a,b)print(a,b)
实例048:数字比大小
a=int(input('a='))
b=int(input('b='))
if a<b:
print('a<b')
elif a>b:
print('a>b')
else:
print('a=b')
实例049:lambda
Max=lambda x,y:x*(x>=y)+y*(y>x)
Min=lambda x,y:x*(x<=y)+y*(y<x)
a=int(input('1:'))
b=int(input('2:'))
print(Max(a,b))
print(Min(a,b))
实例050:随机数
import randomprint(random.uniform(10,20))
实例051:按位与
a=0o77
print(a)
b=a&3
print(b)
b=b&7
print(b)
实例052:按位或
a=0o77
print(a|3)
print(a|3|7)
实例053:按位异或
a=0o77
print(a^3)
print(a^3^7)
a=int(input('输入一个数字: '))b=0 # 0b=~b # 1b=b<<4 # 10000b=~b # 1111c=a>>4d=c&bprint('a:',bin(a))print('b:',bin(b))print('c:',bin(c))print('d:',bin(d))
实例055:按位取反
print(~234)print(~~234)
实例056:画圈
from tkinter import *canvas=Canvas(width=800,height=600,bg='yellow')canvas.pack(expand=YES,fill=BOTH)k=1j=1for i in range(26): canvas.create_oval(310-k,250-k,310+k,250+k,width=1) k+=j j+=0.3mainloop()
实例057:画线
if __name__ == '__main__': from tkinter import * canvas = Canvas(width=300, height=300, bg='green') canvas.pack(expand=YES, fill=BOTH) x0 = 263 y0 = 263 y1 = 275 x1 = 275 for i in range(19): canvas.create_line(x0,y0,x0,y1, width=1, fill='red') x0 = x0 - 5 y0 = y0 - 5 x1 = x1 + 5 y1 = y1 + 5 x0 = 263 y1 = 275 y0 = 263 for i in range(21): canvas.create_line(x0,y0,x0,y1,fill = 'red') x0 += 5 y0 += 5 y1 += 5 mainloop()
实例058:画矩形
if __name__ == '__main__':
from tkinter import *
root = Tk()
root.title('Canvas')
canvas = Canvas(root,width = 400,height = 400,bg = 'yellow')
x0 = 263
y0 = 263
y1 = 275
x1 = 275
for i in range(19):
canvas.create_rectangle(x0,y0,x1,y1)
x0 -= 5
y0 -= 5
x1 += 5
y1 += 5
canvas.pack()
root.mainloop()
实例059:画图 丑
if __name__ == '__main__':
from tkinter import *
canvas = Canvas(width = 300,height = 300,bg = 'green')
canvas.pack(expand = YES,fill = BOTH)
x0 = 150
y0 = 100
canvas.create_oval(x0 - 10,y0 - 10,x0 + 10,y0 + 10)
canvas.create_oval(x0 - 20,y0 - 20,x0 + 20,y0 + 20)
canvas.create_oval(x0 - 50,y0 - 50,x0 + 50,y0 + 50)
import math
B = 0.809
for i in range(16):
a = 2 * math.pi / 16 * i
x = math.ceil(x0 + 48 * math.cos(a))
y = math.ceil(y0 + 48 * math.sin(a) * B)
canvas.create_line(x0,y0,x,y,fill = 'red')
canvas.create_oval(x0 - 60,y0 - 60,x0 + 60,y0 + 60)
for k in range(501):
for i in range(17):
a = (2 * math.pi / 16) * i + (2 * math.pi / 180) * k
x = math.ceil(x0 + 48 * math.cos(a))
y = math.ceil(y0 + 48 + math.sin(a) * B)
canvas.create_line(x0,y0,x,y,fill = 'red')
for j in range(51):
a = (2 * math.pi / 16) * i + (2* math.pi / 180) * k - 1
x = math.ceil(x0 + 48 * math.cos(a))
y = math.ceil(y0 + 48 * math.sin(a) * B)
canvas.create_line(x0,y0,x,y,fill = 'red')
mainloop()
实例060:字符串长度
s='zhangguang101'
print(len(s))
实例061:杨辉三角
def generate(numRows): r = [[1]] for i in range(1,numRows): r.append(list(map(lambda x,y:x+y, [0]+r[-1],r[-1]+[0]))) return r[:numRows]a=generate(10)for i in a: print(i)
实例062:查找字符串
s1='aabbxuebixuebi'
s2='ab'
s3='xue'
print(s1.find(s2))
print(s1.find(s3))
实例063:画椭圆
if __name__ == '__main__':
from tkinter import *
x = 360
y = 160
top = y - 30
bottom = y - 30
canvas = Canvas(width = 400,height = 600,bg = 'white')
for i in range(20):
canvas.create_oval(250 - top,250 - bottom,250 + top,250 + bottom)
top -= 5
bottom += 5
canvas.pack()
mainloop()
实例064:画椭圆、矩形
if __name__ == '__main__':
from tkinter import *
canvas = Canvas(width = 400,height = 600,bg = 'white')
left = 20
right = 50
top = 50
num = 15
for i in range(num):
canvas.create_oval(250 - right,250 - left,250 + right,250 + left)
canvas.create_oval(250 - 20,250 - top,250 + 20,250 + top)
canvas.create_rectangle(20 - 2 * i,20 - 2 * i,10 * (i + 2),10 * ( i + 2))
right += 5
left += 5
top += 10
canvas.pack()
mainloop()
实例065:画组合图形
import math
from tkinter import *
class PTS:
def __init__(self):
self.x = 0
self.y = 0
points = []
def LineToDemo():
screenx = 400
screeny = 400
canvas = Canvas(width = screenx,height = screeny,bg = 'white')
AspectRatio = 0.85
MAXPTS = 15
h = screeny
w = screenx
xcenter = w / 2
ycenter = h / 2
radius = (h - 30) / (AspectRatio * 2) - 20
step = 360 / MAXPTS
angle = 0.0
for i in range(MAXPTS):
rads = angle * math.pi / 180.0
p = PTS()
p.x = xcenter + int(math.cos(rads) * radius)
p.y = ycenter - int(math.sin(rads) * radius * AspectRatio)
angle += step
points.append(p)
canvas.create_oval(xcenter - radius,ycenter - radius,
xcenter + radius,ycenter + radius)
for i in range(MAXPTS):
for j in range(i,MAXPTS):
canvas.create_line(points[i].x,points[i].y,points[j].x,points[j].y)
canvas.pack()
mainloop()
if __name__ == '__main__':
LineToDemo()
实例066:三数排序
raw=[]for i in range(3): x=int(input('int%d: '%(i))) raw.append(x)for i in range(len(raw)):for j in range(i,len(raw)):if raw[i]>raw[j]: raw[i],raw[j]=raw[j],raw[i]print(raw)raw2=[]for i in range(3): x=int(input('int%d: '%(i))) raw2.append(x)print(sorted(raw2))
实例067:交换位置
li=[3,2,5,7,8,1,5]li[-1],li[li.index(min(li))]=li[li.index(min(li))],li[-1]m=li[0]ind=li.index(max(li))li[0]=li[ind]li[ind]=mprint(li)
实例068:旋转数列
from collections import *
li=[1,2,3,4,5,6,7,8,9]
deq=deque(li,maxlen=len(li))
print(li)
deq.rotate(int(input('rotate:')))
print(list(deq))
实例069:报数
if __name__ == '__main__':
nmax = 50
n = int(input('请输入总人数:'))
num = []
for i in range(n):
num.append(i + 1)
i = 0
k = 0
m = 0
while m < n - 1:
if num[i] != 0 : k += 1
if k == 3:
num[i] = 0
k = 0
m += 1
i += 1
if i == n : i = 0
i = 0
while num[i] == 0: i += 1
print(num[i])
实例070:字符串长度II
def lenofstr(s):
return len(s)
print(lenofstr('tanxiaofengsheng'))
实例071:输入和输出
N = 3
#stu
#num : string
#name : string
#score[4]: list
student = []
for i in range(5):
student.append(['','',[]])
def input_stu(stu):
for i in range(N):
stu[i][0] = input('input student num:\n')
stu[i][1] = input('input student name:\n')
for j in range(3):
stu[i][2].append(int(input('score:\n')))
def output_stu(stu):
for i in range(N):
print ('%-6s%-10s' % ( stu[i][0],stu[i][1] ))
for j in range(3):
print ('%-8d' % stu[i][2][j])
if __name__ == '__main__':
input_stu(student)
print (student)
output_stu(student)
实例072:创建链表
class Node:
def __init__(self, data):
self.data = data
self.next = None
def get_data(self):
return self.data
class List:
def __init__(self, head):
self.head = head
def is_empty(self):
return self.get_len() == 0
def get_len(self):
length = 0
temp = self.head
while temp is not None:
length += 1
temp = temp.next
return length
def append(self, node):
temp = self.head
while temp.next is not None:
temp = temp.next
temp.next = node
def delete(self, index):
if index < 1 or index > self.get_len():
print("给定位置不合理")
return
if index == 1:
self.head = self.head.next
return
temp = self.head
cur_pos = 0
while temp is not None:
cur_pos += 1
if cur_pos == index-1:
temp.next = temp.next.next
temp = temp.next
def insert(self, pos, node):
if pos < 1 or pos > self.get_len():
print("插入结点位置不合理")
return
temp = self.head
cur_pos = 0
while temp is not Node:
cur_pos += 1
if cur_pos == pos-1:
node.next = temp.next
temp.next =node
break
temp = temp.next
def reverse(self, head):
if head is None and head.next is None:
return head
pre = head
cur = head.next
while cur is not None:
temp = cur.next
cur.next = pre
pre = cur
cur = temp
head.next = None
return pre
def print_list(self, head):
init_data = []
while head is not None:
init_data.append(head.get_data())
head = head.next
return init_data
if __name__=='__main__':
head=Node('head')
link=List(head)
for i in range(10):
node=Node(i)
link.append(node)
print(link.print_list(head))
实例073:反向输出链表
class Node:
def __init__(self, data):
self.data = data
self.next = None
def get_data(self):
return self.data
class List:
def __init__(self, head):
self.head = head
def is_empty(self):
return self.get_len() == 0
def get_len(self):
length = 0
temp = self.head
while temp is not None:
length += 1
temp = temp.next
return length
def append(self, node):
temp = self.head
while temp.next is not None:
temp = temp.next
temp.next = node
def delete(self, index):
if index < 1 or index > self.get_len():
print("给定位置不合理")
return
if index == 1:
self.head = self.head.next
return
temp = self.head
cur_pos = 0
while temp is not None:
cur_pos += 1
if cur_pos == index-1:
temp.next = temp.next.next
temp = temp.next
def insert(self, pos, node):
if pos < 1 or pos > self.get_len():
print("插入结点位置不合理")
return
temp = self.head
cur_pos = 0
while temp is not Node:
cur_pos += 1
if cur_pos == pos-1:
node.next = temp.next
temp.next =node
break
temp = temp.next
def reverse(self, head):
if head is None and head.next is None:
return head
pre = head
cur = head.next
while cur is not None:
temp = cur.next
cur.next = pre
pre = cur
cur = temp
head.next = None
return pre
def print_list(self, head):
init_data = []
while head is not None:
init_data.append(head.get_data())
head = head.next
return init_data
if __name__=='__main__':
head=Node('head')
link=List(head)
for i in range(10):
node=Node(i)
link.append(node)
print(link.print_list(head))
print(link.print_list(link.reverse(head)))
实例074:列表排序、连接
a=[2,6,8]b=[7,0,4]a.extend(b)a.sort()print(a)
实例075:不知所云
if __name__ == '__main__': for i in range(5): n = 0 if i != 1: n += 1 if i == 3: n += 1 if i == 4: n += 1 if i != 4: n += 1 if n == 3: print (64 + i)
实例076:做函数
def peven(n): i = 0 s = 0.0 for i in range(2,n + 1,2): s += 1.0 / i return sdef podd(n): s = 0.0 for i in range(1, n + 1,2): s += 1.0 / i return sdef dcall(fp,n): s = fp(n) return sif __name__ == '__main__': n = int(input('input a number: ')) if n % 2 == 0: sum = dcall(peven,n) else: sum = dcall(podd,n) print (sum)
实例077:遍历列表
l=['moyu','niupi','xuecaibichi','shengfaji','42']
for i in range(len(l)):
print(l[i])
实例078:字典
if __name__ == '__main__':
person = {"li":18,"wang":50,"zhang":20,"sun":22}
m = 'li'
for key in person.keys():
if person[m] < person[key]:
m = key
print ('%s,%d' % (m,person[m]))
实例079:字符串排序
l=['baaa','aaab','aaba','aaaa','abaa']l.sort()print(l)
实例080:猴子分桃
if __name__ == '__main__':
i = 0
j = 1
x = 0
while (i < 5) :
x = 4 * j
for i in range(0,5) :
if(x%4 != 0) :
break
else :
i += 1
x = (x/4) * 5 +1
j += 1
print(x)
for p in range(5):
x=(x-1)/5*4
print(x)
实例081:求未知数
a = 809
for i in range(10,100):
b = i * a
if b >= 1000 and b <= 10000 and 8 * i < 100 and 9 * i >= 100:
print(b,' = 800 * ', i, ' + 9 * ', i)
for i in range(10,100):
if 8*i>99 or 9*i<100:
continue
if 809*i==800*i+9*i:
print(i)
break
实例082:八进制转十进制
n=eval('0o'+str(int(input('八进制输入:'))))
print(n)
实例083:制作奇数
if __name__ == '__main__':
sum = 4
s = 4
for j in range(2,9):
print (sum)
if j <= 2:
s *= 7
else:
s *= 8
sum += s
print('sum = %d' % sum)
实例084:连接字符串
delimiter = ','
mylist = ['Brazil', 'Russia', 'India', 'China']
print(delimiter.join(mylist))
实例085:整除
if __name__ == '__main__': zi = int(input('输入一个数字:')) n1 = 1 c9 = 1 m9 = 9 sum = 9 while n1 != 0: if sum % zi == 0: n1 = 0 else: m9 *= 10 sum += m9 c9 += 1 print ('%d 个 9 可以被 %d 整除 : %d' % (c9,zi,sum)) r = sum / zi print ('%d / %d = %d' % (sum,zi,r))
实例086:连接字符串II
a='guangtou'
b='feipang'
print(b+a)
实例087:访问类成员
if __name__ == '__main__': class student: x = 0 c = 0 def f(stu): stu.x = 20 stu.c = 'c' a= student() a.x = 3 a.c = 'a' f(a) print(a.x,a.c)
实例088:打印星号
for i in range(3):print('*'*int(input('input a number: ')))
实例089:解码
n=input()
n = str(n)
a=[]
for i in range(4):
a.append(int(n[i])+5)
a[0],a[3]=a[3],a[0]
a[1],a[2]=a[2],a[1]
print ("".join('%s' %s for s in a))
实例090:列表详解
#list
#新建列表
testList=[10086,'中国移动',[1,2,4,5]]
#访问列表长度
print (len(testList) )
#到列表结尾
print (testList[1:])
#向列表添加元素
testList.append('i\'m new here!')
print (len(testList) )
print (testList[-1] )
#弹出列表的最后一个元素
print (testList.pop(1) )
print (len(testList) )
print (testList )
st comprehension
#后面有介绍,暂时掠过
matrix = [[1, 2, 3],
[4, 5, 6],
[7, 8, 9]]
print (matrix )
print (matrix[1] )
col2 = [row[1] for row in matrix]#get a column from a matrix
print (col2 )
col2even = [row[1] for row in matrix if row[1] % 2 == 0]#filter odd item
print (col2even)
实例091:time模块
if __name__ == '__main__': import time print (time.ctime(time.time())) print (time.asctime(time.localtime(time.time()))) print (time.asctime(time.gmtime(time.time())))
实例092:time模块II
if __name__ == '__main__':
import time
start = time.time()
for i in range(3000):
print(i)
end = time.time()
print (end - start)
实例093:time模块III
if __name__ == '__main__': import time start = time.clock() for i in range(100): print(i) end = time.clock() print('different is %6.3f' % (end - start))
实例094:time模块IV
if __name__ == '__main__': import time import random play_it = input('do you want to play it.(\'y\' or \'n\')') while play_it == 'y': c = input('input a character:\n') i = random.randint(0,2**32) % 100 print ('please input number you guess:\n') start = time.clock() a = time.time() guess = int(input('input your guess:\n')) while guess != i: if guess > i: print('please input a little smaller') guess = int(input('input your guess:\n')) else: print('please input a little bigger') guess = int(input('input your guess:\n')) end = time.clock() b = time.time() var = (end - start) / 18.2 print (var) # print 'It took you %6.3 seconds' % time.difftime(b,a)) if var < 15: print ('you are very clever!') elif var < 25: print ('you are normal!') else: print ('you are stupid!') print ('Congradulations') print ('The number you guess is %d' % i) play_it = input('do you want to play it.')
实例095:转换时间格式
from dateutil import parser
dt = parser.parse("Aug 28 2015 12:00AM")
print (dt)
实例096:计算复读次数
s1='xuebixuebixuebixuebixuebixuebixuebixue'
s2='xuebi'
print(s1.count(s2))
实例097:磁盘写入
if __name__ == '__main__':
from sys import stdout
filename = input('输入文件名:\n')
fp = open(filename,"w")
ch = input('输入字符串:\n')
while ch != '#':
fp.write(ch)
stdout.write(ch)
ch = input('')
fp.close()
实例098:磁盘写入II
if __name__ == '__main__': fp = open('test.txt','w') string = input('please input a string:\n') string = string.upper() fp.write(string) fp = open('test.txt','r') print (fp.read()) fp.close()
实例099:磁盘读写
if __name__ == '__main__':
import string
fp = open('test1.txt')
a = fp.read()
fp.close()
fp = open('test2.txt')
b = fp.read()
fp.close()
fp = open('test3.txt','w')
l = list(a + b)
l.sort()
s = ''
s = s.join(l)
fp.write(s)
fp.close()
实例100:列表转字典
i = ['a', 'b']l = [1, 2]print (dict(zip(i,l)))
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