常用的10个Python实用小技巧

tem = 'I Love Python '
print(tem * 3)
I Love Python I Love Python I Love Python

sum(i for i in range(100) )

List = ["I","Love","Python"]
a, b, c = List
print(a,b,c )
#I Love Python
print(c,b,a )
#Python Love I

import sys
a, b, c,d = "I" ,"Love", "Python", 2020
print(sys.getsizeof(a))
#50
print(sys.getsizeof(b))
#53
print(sys.getsizeof(c))
#55
print(sys.getsizeof(d))
#28

#方法1
List = ["I","Love","Python"]
List.reverse()
print(List)
#['Python', 'Love', 'I']
#方法2
List = ["I","Love","Python"]
List = List[::-1]
print(List)
#['Python', 'Love', 'I']

a,b = 'zaoqi' , 'Python'
a,b = b,a

List = ['I ', 'Love ', 'Python']
print(''.join(List))
#I Love Python

import itertools
List = [[1, 2], [3, 4], [5, 6]]
print(list(itertools.chain.from_iterable(List)))
#[1, 2, 3, 4, 5, 6]

matrix = [[1, 2, 3], [4, 5, 6]]
print(list(zip(*matrix)))
#[(1, 4), (2, 5), (3, 6)]

a = ['I', 'Love', 'Python']
b = ['I', 'Love', 'python']
print(set(a).difference(set(b)))
print(set(a).intersection(b))
#{'Python'}
#{'Love', 'I'}