1
2
3
4
5
if 2 > 1 and not 2 > 3:
    print('Correct Judgement!')

# Correct Judgement!

1
2
3
4
5
if expression:
    expr_true_suite
else:
    expr_false_suite

1
2
3
4
5
6
7
8
9
10
11
12
13
temp = input('请输入成绩:')
source = int(temp)
if 100 >= source >= 90:
    print('A')
elif 90 > source >= 80:
    print('B')
elif 80 > source >= 60:
    print('C')
elif 60 > source >= 0:
    print('D')
else:
    print('输入错误！')

1
2
3
4
5
6
my_list = ['lsgogroup']
my_list.pop(0)
assert len(my_list) > 0

# AssertionError

1
2
3
while 布尔表达式:
    代码块

1
2
3
4
5
while 布尔表达式:
    代码块
else:
    代码块

1
2
3
for 迭代变量 in 可迭代对象:
    代码块

1
2
3
4
5
for 迭代变量 in 可迭代对象:
    代码块
else:
    代码块

1
2
range([start,] stop[, step=1])

1
2
enumerate(sequence, [start=0])

1
2
3
4
5
6
7
8
seasons = ['Spring', 'Summer', 'Fall', 'Winter']
lst = list(enumerate(seasons))
print(lst)
# [(0, 'Spring'), (1, 'Summer'), (2, 'Fall'), (3, 'Winter')]
lst = list(enumerate(seasons, start=1))  # 下标从 1 开始
print(lst)
# [(1, 'Spring'), (2, 'Summer'), (3, 'Fall'), (4, 'Winter')]

1
2
[ expr for value in collection [if condition] ]

1
2
3
4
5
x = [-4, -2, 0, 2, 4]
y = [a * 2 for a in x]
print(y)
# [-8, -4, 0, 4, 8]

1
2
( expr for value in collection [if condition] )

1
2
3
4
5
6
7
8
9
a = (x for x in range(10))
print(a)

# <generator object <genexpr> at 0x0000025BE511CC48>

print(tuple(a))

# (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)

1
2
{ key_expr: value_expr for value in collection [if condition] }

1
2
3
4
b = {i: i % 2 == 0 for i in range(10) if i % 3 == 0}
print(b)
# {0: True, 3: False, 6: True, 9: False}

1
2
{ expr for value in collection [if condition] }

1
2
3
4
c = {i for i in [1, 2, 3, 4, 5, 5, 6, 4, 3, 2, 1]}
print(c)
# {1, 2, 3, 4, 5, 6}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
d = 'i for i in "I Love Lsgogroup"'
print(d)
# i for i in "I Love Lsgogroup"

e = (i for i in range(10))
print(e)
# <generator object <genexpr> at 0x0000007A0B8D01B0>

print(next(e))  # 0
print(next(e))  # 1

for each in e:
    print(each, end=' ')

# 2 3 4 5 6 7 8 9

s = sum([i for i in range(101)])
print(s)  # 5050
s = sum((i for i in range(101)))
print(s)  # 5050

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
passwdList = ['123', '345', '890']
valid = False
count = 3
while count > 0:
    password = input('enter password:')
    for item in passwdList:
        if password == item:
            valid = True
            break
            
    if not valid:
        print('invalid input')
        count -= 1
        continue
    else:
        break