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‎python_basic/main.md‎

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## Python基础
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1. [时间格式转换](时间格式转换.md)

‎python_basic/时间格式转换.md‎

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* Str-parse-time: “时间字符串”转换成“时间对象”
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* Str-format-time: “时间对象”转换成“时间字符串”
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## time模块
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```python
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import time
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time.time() # 1529653382.830719
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# time.struct_time(tm_year=2018, tm_mon=5, tm_mday=16, tm_hour=10, tm_min=21, tm_sec=2, tm_wday=2, tm_yday=136, tm_isdst=0)
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time.localtime()
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# 把时间（time.struct_time）转换成指定格式的字符串
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# '2018-06-22 15:49:59'
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time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
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# 把时间戳转换为指定格式字符串
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time.strftime('%Y%m%d%H%M%S', time.localtime(1529653382.830719))
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```
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## datetime模块
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```python
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import datetime
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# 把 “指定格式的时间字符串” 转换为“datetime对象”
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dt_str = '2018-02-09 07:19:50'
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dt_obj = datetime.datetime.strptime(dt_str, "%Y-%m-%d %H:%M:%S")
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# datetime.datetime(2018, 2, 9, 7, 19, 50)
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dt_obj
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# 把“datetime对象” 转换为 “指定格式的时间字符串”
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# '20180209071950'
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dt_obj.strftime("%Y%m%d%H%M%S")
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# 把“指定格式的时间字符串” 转换为 “时间戳对象”
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dt_obj = datetime.datetime.strptime(s , "%Y-%m-%d %H:%M:%S")
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# 1518131990.0
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time.mktime(dt_obj.timetuple())
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# 把“指定格式的时间字符串” 转换为 “时间戳对象”
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# 1518131990.0
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time.mktime(time.strptime(s,'%Y-%m-%d %H:%M:%S'))
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```

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