python3 时间戳、格式化时间相互转换的函数封装

import time

# =====封装函数：格式化时间转成时间戳======
def format_time_to_timestamp(format_time=None):
    if format_time:
        time_tuple = time.strptime(format_time,'%Y-%m-%d %X')
        result = time.mktime(time_tuple)
        return int(result)
    return int(time.time())

#查看调用结果
print(format_time_to_timestamp())
print(format_time_to_timestamp('2009-10-10 18:01:11'))

# ==========封装函数：时间戳转换成格式化时间==========
def timestamp_to_format_time(timestamp=None,format='%Y-%m-%d %X'):
    if timestamp:
        time_tuple = time.localtime(timestamp)
        result = time.strftime(format,time_tuple)
        return result
    else:
        return time.strftime(format)

#查看调用结果
print(timestamp_to_format_time())
print(timestamp_to_format_time(1255168871))