python常用表达式

时间：2021-09-11 15:31:08 收藏：0 阅读：21

enumerate(iterable, start=0)


seasons = [‘Spring‘, ‘Summer‘, ‘Fall‘, ‘Winter‘]
list(enumerate(seasons))
[(0, ‘Spring‘), (1, ‘Summer‘), (2, ‘Fall‘), (3, ‘Winter‘)]
list(enumerate(seasons, start=1))
[(1, ‘Spring‘), (2, ‘Summer‘), (3, ‘Fall‘), (4, ‘Winter‘)]

Equivalent to:

def enumerate(sequence, start=0):
    n = start
    for elem in sequence:
        yield n, elem
        n += 1

获取当前日期和时间

from datetime import datetime
>>> now = datetime.now() # 获取当前datetime
>>> print(now)
2015-05-18 16:28:07.198690
>>> print(type(now))
<class ‘datetime.datetime‘>

Base64是一种用64个字符来表示任意二进制数据的方法。Base64是一种最常见的二进制编码方法。

原文：https://www.cnblogs.com/WSugar/p/15093127.html