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print("Hello World!")

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class zxm():
	def __init__(self):
		self.x=0
		self.y=0

	def move_up(self):
		self.y +=1

my_zxm=zxm()
print(my_zxm)

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<__main__.zxm object at 0x000001D99CFEF668>

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x=eval(input("请输入 x 的值："))
y=eval(input("请输入 y 的值："))
z=(x**2+y**2)**0.5
print(z)

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# 导入复数数学模块
import cmath

num = int(input("请输入一个数字："))
num_sqrt = cmath.sqrt(num)
print('{0} 的平方根为 {1:0.3f}+{2:0.3f}j'.format(num ,num_sqrt.real,num_sqrt.imag))

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x=[1,10]
type(x)#判断元素类型

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list

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for x in range(1,10,2): # (start,stop,step)
    pass # pass 不做任何事情，一般用做占位语句

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for letter in 'Python':
   if letter == 'h':
      pass
      print('这是 pass 块')
   print('当前字母 :'+ letter)

print("Good bye!")

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当前字母 :P
当前字母 :y
当前字母 :t
这是 pass 块
当前字母 :h
当前字母 :o
当前字母 :n
Good bye!

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x=10
print("整数转字符串"+str(x))

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import this

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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!