29时间流逝不过是数字加减，逻辑真假也无非零一相间

1. if str.isnumeric() == True:if str.isnumeric()
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   1. bool()
   1. time函数
   1. datetime类now()方法
   1. strftime()方法
   1. timedelta类
   1. 不能
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   1. pyplot.xticks()yticks()pyplot.xticks( [ 3, 5 ], [‘张三’,’李四’] )

a=Trueb=False(a or c)if a or c :abor
if b and a :band
“短路运算”
if a and b :

25 and 3760 and 25

1. 25 and 376
2. 25 and 376True and True
3. 25 and 376 0 and 25
   or

• and
• or

Python官方文档| | | | | —- | —- | —- | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 000000 - 999999 | | | |
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   1. (本计算式的结果需要先理解“短路运算”，请见本节“参考阅读”）
   1. (本计算式的结果需要先理解“短路运算”，请见本节“参考阅读”）

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pyplot.xticks(y,t)

• myplot(x,y)
  - myplot(x,y,t)