死循环:
while 1==1:
print('ok',time.time)
字节:
UTF8:中文3字节
GBK:中文2字节
input()
input输入类型都是字符串
字符串转换为数字:
n = input()
new_n = int(n)
continue:
终止当前循环,进行下一次循环
break:
跳出当前全部循环
name = “michael jordan”
if "michale" (not) in name:
print("OK")
else:
print("ERROR")
整体注释:ctrl+?
布尔值也是一种数据类型
v = 1 == 2
print(v)
<>不等于
自加:+=
成员运算:not (in)
true or ==> true
true and ==> 继续判断
false or ==> 继续判断
false and ==> false
算数运算
a = 10 + 10
赋值运算
a = a + 1
比较运算
> < !=
逻辑运算
or and
成员运算:
not in
数据类型:
int
str
list
tuple
bool
dict
set
字符串切片:
test = "asdfgjk"
test1 = test[0:-1]