1、整数:
- 在python中,可对整数执行加(+)、减(-)、乘(*)、除(/)运算。
- python使用两个乘号表示乘方运算:3**2 —> 9
- 可以使用括号(),修改运算次序。
2、浮点数:
3、函数str():
让Python将非字符串值表示为字符串。
4、注释:
在python中,注释用井号(#)标示。
也可使用""" “”"进行跨行注释。
5、python之禅:
Beautiful is better than ugly.
优美胜于丑陋,
Explicit is better than implicit.
明了胜于晦涩,
Simple is better than complex.
简洁胜于复杂,
Complex is better than complicated.
复杂胜于晦涩,
Flat is better than nested.
扁平胜于嵌套,
Sparse is better than dense.
间隔胜于紧凑,
Readability counts.
可读性很重要。
Special cases aren’t special enough to break the rules.
再特殊的情况也不能违背这些规则。
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
不要包容所有的错误,除非你确定需要这样做,
In the face of ambiguity, refuse the temptation to guess.
当存在多种可能,不要尝试去猜测,
There should be one-- and preferably only one --obvious way to do it.
而是尽量找一种,最好是唯一一种明显的解决方案;
Although that way may not be obvious at first unless you’re Dutch.
虽然这并不容易,因为你不是Python之父;
Now is better than never.
做永远好过不做,
Although never is often better than right now.
动手之前要细思量(但不假思索就动手还不如不做)
If the implementation is hard to explain, it’s a bad idea.
如果你无法向人描述你的方案,那肯定不是一个好方案;
If the implementation is easy to explain, it may be a good idea.
如果方案容易描述,那也许是个好方案;
Namespaces are one honking great idea – let’s do more of those!
命名空间是一种绝妙的理念,我们应当多加利用。