1 注释，数学运算，print，字符串连接和重复

'''

these are comments

my first py prog

'''
print("math copute: \n")

a=2
b=3
c=a+b
d=a**b 

####     " " 里面原样输出， 多个输出 用 ，    #############
print("a =",a,", b =",b,", a + b =",c,", a ** b =",a**b)

a=11
b=2
c=a//b         # // 是整除运算 
print("a =",a,", b =",b,", a // b =",c,", a % b =",a%b)

 

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使用 + 连接字符串

使用 * 构造多个字符串