第6行'if/elif statements‘和' and /or statements’出现语法错误

Question

当我尝试运行这段代码时，我不断地在第6行得到一个语法错误。我已经尝试过处理缩进，并浏览了这个网站上的相关问题，但都无济于事。任何帮助都将不胜感激！谢谢!

#program that reads month and day and outputs season
input_month = input()
input_day = int(input())

#input reading for spring
if ((input_month == 'March') and (20 <= input_day <= 31))
or ((input_month == 'June') and (1 <= input_day <= 20))
    print('Spring')

#input reading for summer
elif (input_month == 'June') and (21 <= input_day <= 30) 
or (input_month == 'September') and (1 <= input_day <= 30)
    print('Summer')

#input reading for Autumn
elif (input_month == 'September') and (22 <= input_day <= 30) 
or (input_month == 'December') and (1 <= input_day <= 20)
    print('Autumn')

#input reading for winter
elif (input_month == 'December') and (21 <= input_day <= 31) 
or (input_month == 'January') and (1 <= input_day <= 31)
or (input_month == 'February') and (1 <= input_day <= 28)
or (input_month == 'March') and (1 <= input_day <= 19)
    print('Winter')

编辑:错误显示为'EOL error‘，这在过去意味着我没有定义变量或者没有正确地写入变量。然而，情况似乎并非如此。

感谢大家的帮助！！

以下是更新后的工作代码，包括所有月份：

#program that reads month and day and outputs season
input_month = input()
input_day = int(input())

#input reading for spring
if input_month == 'March' and 20 <= input_day <= 31\
or input_month == 'April' and 1 <= input_day <= 30\
or input_month == 'May' and 1 <= input_day <= 31\
or input_month == 'June' and 1 <= input_day <= 20:
    print('Spring')

#input reading for summer
elif input_month == 'June' and 21 <= input_day <= 30\
or input_month == 'July' and 1 <= input_day <= 31\
or input_month == 'August' and 1 <= input_day <= 31\
or input_month == 'September' and 1 <= input_day <= 30:
    print('Summer')

#input reading for Autumn
elif input_month == 'September' and 22 <= input_day <= 30\
or input_month == 'October' and 1 <= input_day <= 31\
or input_month == 'November' and 1 <= input_day <= 30\
or input_month == 'December' and 1 <= input_day <= 20:
    print('Autumn')

#input reading for winter
elif input_month == 'December' and 21 <= input_day <= 31\
or input_month == 'January' and 1 <= input_day <= 31\
or input_month == 'February' and 1 <= input_day <= 28\
or input_month == 'March' and 1 <= input_day <= 19:
    print('Winter')

#if input is not valid
else:
    print('Invalid')

Answer 1

这是一个语法正确的代码(带反斜杠)：

input_month = input()
input_day = int(input())

if input_month == 'March' and 20 <= input_day <= 31 or input_month \
    == 'June' and 1 <= input_day <= 20:
    print('Spring')
elif input_month == 'June' and 21 <= input_day <= 30 or input_month \
    == 'September' and 1 <= input_day <= 30:
    print('Summer')
elif input_month == 'September' and 22 <= input_day <= 30 \
    or input_month == 'December' and 1 <= input_day <= 20:
    print('Autumn')
elif input_month == 'December' and 21 <= input_day <= 31 or input_month \
    == 'January' and 1 <= input_day <= 31 or input_month == 'February' \
    and 1 <= input_day <= 28 or input_month == 'March' and 1 \
    <= input_day <= 19:
    print('Winter')

但是，有一些方法可以使解决方案更具可读性、pythonic风格和紧凑性。例如，如下所示：

MONTHS = ["January", "February", "March", "April", "May", "June",
          "July", "August", "September", "October", "November",
          "December"]

BOUNDARIES = [((3, 20), (6, 20), "Spring"),
              ((6, 21), (9, 21), "Summer"),  # FIXED THE UPPER BOUNDARY
              ((9, 22), (12, 20), "Autumn"),
              ((12, 21), (12, 31), "Winter"),
              ((1, 1), (3, 19), "Winter")]

input_month = input()
input_day = int(input())

input_date = (MONTHS.index(input_month) + 1, input_day)

for lower, upper, season in BOUNDARIES:
    if lower <= input_date <= upper:
        print(season)
        break

或者(效率较低的方式)如下所示：

SEASONS = {"Spring": [
               ("March", (20, 32)),
               ("June", (1, 21)),
                ],
           "Summer": [
               ("June", (21, 31)),
               ("September", (1, 31)),
                ],
           "Autumn": [
               ("September", (22, 31)),
               ("December", (1, 21)),
                ],
           "Winter": [
               ("December", (21, 32)),
               ("January", (1, 32)),
               ("February", (1, 29)),
               ("March", (1, 20)),
                ]
           }

input_month = input()
input_day = int(input())

for season in SEASONS:
    for month, day_ranges in SEASONS[season]:
        if input_month == month and input_day in range(*day_ranges):
            print(season)
    else:
        continue
    break

Answer 2

您首先会忘记在每个if和else语句的末尾使用分号。如果你想在下一行继续你的语句，在行尾使用"\“。我在下面举一个例子。

if (input_month == 'June') and (21 <= input_day <= 30) \
  or (input_month == 'September') and (1 <= input_day <= 30):
print('Summer')

Answer 3

这是您的解决方案的正确和有效的代码。

input_month = input()
input_day = int(input())

# input reading for spring
if ((input_month == 'March') and (20 <= input_day <= 31)) or ((input_month == 'June') and (1 <= input_day <= 20)):
    print('Spring')

# input reading for summer
elif (input_month == 'June') and (21 <= input_day <= 30) or (input_month == 'September') and (1 <= input_day <= 30):
    print('Summer')

# input reading for Autumn
elif (input_month == 'September') and (22 <= input_day <= 30) or (input_month == 'December') and (1 <= input_day <= 20):
    print('Autumn')

# input reading for winter
elif (input_month == 'December') and (21 <= input_day <= 31) or (input_month == 'January') and (
        1 <= input_day <= 31) or (input_month == 'February') and (1 <= input_day <= 28) or (
        input_month == 'March') and (1 <= input_day <= 19):
    print('Winter')