Python中的 any() 函数和 all() 函数

a = [1, 2, 3, 4]


def is_big_0(l):
    # 判断列表l的所有数字是否大于，如果大于0则返回True，否则返回False
    for i in l:
        if i <= 0:
            return False
    return True


print(a)

# None 的真假值是 False
print(bool(None))
# 输出 False

# 一个空字符串（""）的真假值是 False
print(bool(""))
# 输出 False

# 一个空字符串或任何可迭代对象的真假值是 False
print(bool([]))
# 输出 False

# 0 {int (0), float (0.0) 和 complex (0j)} 的真假值是 False
print(bool(0))
# 输出 False

list_1 = [0, 0, 0, 1, 0, 0, 0, 0]
# any(a list with at least one non-zero entry) returns True
print(any(list_1))
# Output True

list_2 = [0j, 0, 0, 0.0, 0, 0, 0.0, 0]
# any(a list of zeros) returns False
print(any(list_2))
# Output False

list_3 = [True, False, False]
# any(a list with at least one True value) returns True
print(any(list_3))
# Output True

list_4 = ["", "", "code more"]
# any(a list with at least one non-empty string) returns True
print(any(list_4))
# Output True

list_5 = ["", "", ""]
# any(a list of empty strings) returns False
print(any(list_5))
# Output False

# 列表推导式
 [output_expression for every_item in an_iterable]
     |
     |
     V
    result of doing something on each item in the iterable
    
 # 本质上，循环遍历迭代，对每一项进行操作，然后返回操作的结果。

my_string = "coding**is**cool**345"
# 列表推导
are_there_digits = [char.isdigit() for char in my_string]
# 调用any函数
print(any(are_there_digits))

# 输出 True

my_string = "coding**is**cool**345"
# 列表推导
are_there_digits = [char.isdigit() for char in my_string]
print(are_there_digits)
# Output
# [False, False, False, False, False, False, False, False, False, False, False,
# False, False, False, False, False, False, False, True, True, True]

my_string = "***456278)))"
num = [char.isalpha() for char in my_string]
print(any(num))

# Output False

if c1 or c2 or ... c_(N-1) or CN:
    # DO THIS
    pass
else:
    # DO THIS
    pass

conditions = [c1, c2, ..., c_N]
if any(conditions):
    # DO THIS
    pass
else:
    # DO THIS
    pass

my_string = "coding**is**cool"
are_all_letters = [char.isalpha() for char in my_string]
print(all(are_all_letters))
# Output False

print(are_all_letters)
# Output
# [True, True, True, True, True, True, False, False, True, True, False, False,
# True, True, True, True]

my_string = "56456278"
are_all_digits = [char.isdigit() for char in my_string]
print(all(are_all_digits))
# Output True

print(are_all_digits)
# Output [True, True, True, True, True, True, True, True]

if c1 and c2 and ... c_(N-1) and CN:
    # DO THIS
    pass
else:
    # DO THIS
    pass

conditions = [c1, c2, ..., c_N]

if all(conditions):
    # DO THIS
    pass
else:
    # DO THIS
    pass