要解决遍历列表时没有返回期望值的问题,可以使用以下方法:
def find_expected_value(my_list, expected_value):
for item in my_list:
if item == expected_value:
return item
return None # 如果没有找到期望值,返回None或其他指定的默认值
my_list = [1, 2, 3, 4, 5]
expected_value = 3
result = find_expected_value(my_list, expected_value)
print(result) # 输出:3
def find_expected_value(my_list, expected_value):
result = [item for item in my_list if item == expected_value]
return result[0] if result else None
my_list = [1, 2, 3, 4, 5]
expected_value = 3
result = find_expected_value(my_list, expected_value)
print(result) # 输出:3
def find_expected_value(my_list, expected_value):
try:
index = my_list.index(expected_value)
return my_list[index]
except ValueError:
return None
my_list = [1, 2, 3, 4, 5]
expected_value = 3
result = find_expected_value(my_list, expected_value)
print(result) # 输出:3
以上是三种常见的解决方法,根据具体情况选择适合的方法即可。