Python实现平方列表中每个数字的多种方法

• map
  map(function,iterable)

x = [1,2,3,4,5]
def square(num):
    return num*num
print(list(map(square,x)))
#output:[1, 4, 9, 16, 25]

• lambda
  lambda x:

x = [1,2,3,4,5]
print(list(map(lambda num:num*num, x)))
#output:[1, 4, 9, 16, 25]

• list comprehensions
  [funtion for item in iterable]

print([ num*num for num in [1,2,3,4,5]])
#output:[1, 4, 9, 16, 25]