至此——捅破python的窗户纸

一 python的数字运算

1 整数运算

整数的 ➕ ➖ ✖️ /，可以使用（）决定运算次序，可以用**表示幂运算，如：2的3次方等于8（2³=8）

a = 2**3
print("a =",a)

a = 8
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【函数】str()，将整数（其他数据类型应该也可以吧，暂时还没试过）转为字符串。
【版本不同】python2中，整数的除法结果为整数，小数部分直接被删除。
习题 数字6

print("最数字：")
print( 5 + 1 )
print( 8 - 2 )
print( 2 * 3 )
print( 24 / 4 )

最数字：
6
6
6
6.0
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2 转换为字符串str()

message = "happy" + 23 + "rd Birthday"
print(message)

Traceback (most recent call last):
  File "/Users/XX/Desktop/python_work/number.py", line 6, in <module>
    message = "happy " + 23 + "rd Birthday"
TypeError: can only concatenate str (not "int") to str

使用str()转化以后

age = 23
message = "happy " + str(age) + "rd Birthday"
print(message)

happy 23rd Birthday
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3 注释

用#来标示，其后的内容都会被python忽略

#打印带有年龄的生日快乐
age = 23
message = "happy " + str(age) + "rd Birthday"
print(message)

happy 23rd Birthday
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二python之禅

#Python之禅
import this

The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!
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译文——来自有道翻译，求较真儿哈～～
《Python之禅》(The Zen of Python)，蒂姆·彼得斯(Tim Peters)著

美丽总比丑陋好。
显式的比隐式的好。
简单总比复杂好。/好维护，更易懂
复杂总比复杂好。/现实愿就复杂，可行优先
平铺总比嵌套好。
稀疏总比稠密好。
可读性。
特殊情况并不特别到足以违反规则。
尽管实用性胜过纯洁性。
错误不应该悄无声息地过去。
除非显式地沉默。
面对模棱两可的情况，拒绝猜测的诱惑。
应该有一种——最好是只有一种——显而易见的方法。
尽管这种方式一开始可能并不明显，除非你是荷兰人。
现在总比没有好。
尽管“从不”常常比“现在”更好。
如果实现很难解释，那就是个坏主意。
如果实现很容易解释，这可能是一个好主意。
名称空间是一个伟大的想法——让我们做更多这样的事情!

感觉穿越时空，和python的作者对话一样，虽然只是单向的。