import keyword
print(keyword.kwlist)
# ['False', 'None', 'True', 'and', 'as', 'assert', 'async', 'await', 'break',
# 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'finally',
# 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'nonlocal',
# 'not', 'or', 'pass', 'raise', 'return', 'try', 'while', 'with', 'yield']
# a = 5
# b = 10
# c = 6
# print(a != b)
# print(a<b and b<c)
# print(1>2 and 3 < 4 or 4>5 and 2 > 1 or 9< 8)
# 优先级 () not and or
# x or y x为真就是x 否y
# x and y x为真就是y 否x
# not x x为真就是false 否 true
# in 在什么什么里面
# not in 不在什么什么里面
print('ni' not in 'nihaoma')
# 三元运算符
# 结果1 if 条件 else 结果2 true就是 if左边的 否 右边
re = 55 if 3 > 2 else 66
print(re)
print('if' in keyword.kwlist)
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import keyword
# print('if' in keyword.kwlist) #查看if是否是关键字
# if 表达式 :
# if 5<3 :
# print('张飞')
# print('李艳')
# if 条件:
# pass
# else:
# pass
# a,b=5,3
# if a>b :
# print(a)
# else:
# print(b)
# 嵌套if
a,b,c = 5,3,2
# if a>b:
# if a>c:
# print(a)
# else:
# print(c)
# else:
# if b>c:
# print(b)
# else:
# print(c)
# 多重判断
# score = 99;
# if score >= 0 and score <= 60:
# print('及格')
# elif score >= 61 and score <= 80:
# print('良好')
# elif score >=81 and score <=100:
# print('优秀')
if len('1') > 3:
print('长')
if 'nihao'.startswith('ni'): #以什么开头startswith
print(True)
if (i := 5) < 3:
print(i)
if (n := len(a)) > 3 :
print('你好')