一.格式化输出
%s: 字符串的占位符, 可以放置任何内容(数字)
%d: 数字的占位符
age="18"
name="小明"
print("我叫%s"% "小明")
print("我叫%s,今年%s岁" % (name,age) )
二.常见运算符
计算机常用的数据
print(2**0) # 代表2的0次方
print(2**1) #2的一次方
print(2**2) #同上
print(2**3)
print(2**4)
print(2**5)
print(2**6)
print(2**7)
print(2**8)
print(2**9)
print(2**10)
赋值运算.
a = 10
a += 20 # 相当于a = a + 20
print(a)
print(not not not not not not False)
(and ,or, not) 同时存在. 先算括号, 然后算not, 然后算and , 最后算or
print(3>4 or 4<3 and 1==1) # False
print(1 < 2 and 3 < 4 or 1>2 ) # T
print(2 > 1 and 3 < 4 or 4 > 5 and 2 < 1) # T
print(1 > 2 and 3 < 4 or 4 > 5 and 2 > 1 or 9 < 8) # F
print(1 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6)
print(not 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6) # F
x or y 如果x==0 那么就是y, 否则是x
print(1 or 2) # 1
print(2 or 3) # 2
print(0 or 3) # 3
print(0 or 4) # 4
print(0 or 1 or 3 or 0 or 5) #
print(1 and 2) # 2
print(2 and 0) # 0
print(0 and 3) # 0
print(0 and 4) # 0
print(0 or 4 and 3 or 7 or 9 and 6)
print(2 > 3 and 3) # false相当于0
print(2 < 1 and 4 > 6 or 3 and 4 > 5 or 6)#结果可能是数字也可能是True和False