Chess Problem v4

Chess Problem v4

象棋问题v4

OK, final stop in chess land, extending check_move() again. Previously, your function took two separate arguments: a column and a row value. Now you will rewrite the function to accept the board position as a single str argument. In other words, the input to check_move(position) will now be a single position string such as 'B5', that encodes both the column and the row designator.

好的，象棋世界的最后一站，再次扩展' check_move() '。以前，函数有两个单独的参数:一个列值和一个行值。现在您将重写函数，以接受董事会位置作为单个' str '参数。换句话说，' check_move(position) '的输入现在将是一个单一的位置字符串，例如" B5' '，它对列指示符和行指示符进行了编码。

• When both the coordinates in position are valid, for example, 'c4', the function returns 'The piece is moved to C4.'.
• 当“position”中的两个坐标都有效时，例如，“c4”，函数返回“the piece is moved to c4 .' '”。
• If position has too many or too few characters, return 'The position is not valid.'
• 如果“position”字符过多或过少，则返回“位置无效”。
• If the column designator is out of range (regardless of whether the row designator is valid or not) return 'The column value is not in the range a-h or A-H!'.
• 如果列指示符超出范围(不管行指示符是否有效)，返回“列值不在范围a-h或a-h !”
• Otherwise, if the row designator is out of range, return 'The row value is not in the range 1 to 8!'.
• 否则，如果行指示符超出范围，则返回“行值不在1到8的范围内!”

Note that, irrespective of the casing of the column value, your code should output the value in upper case. Also note that there is no guarantee that the input is made up of exactly two characters.

请注意，无论列值的大小写如何，代码都应该以大写输出值。还要注意，不能保证输入恰好由两个字符组成。

Your function should work like this:

你的函数应该像这样工作:

>>> check_move('B4')
'The piece is moved to B4.'
>>> check_move('b4')
'The piece is moved to B4.'

and like this with an invalid input:

像这样输入无效:

>>> check_move('I4')
'The column value is not in the range a-h or A-H!'
>>> check_move('F9')
'The row value is not in the range 1 to 8!'
>>> check_move('A')
'The position is not valid.'

Answer

def check_move(position):
    # 如果位置字符串长度不是2个字符，返回无效位置错误
    if len(position) != 2:
        return 'The position is not valid.'
    
    # 分别将位置字符串中的第一个字符作为列，第二个字符作为行
    column, row = position[0], position[1]

    # 如果列值不在 a-h 或 A-H 的范围内，返回列值范围错误
    if not (column.lower() >= 'a' and column.lower() <= 'h'):
        return 'The column value is not in the range a-h or A-H!'
    # 如果行值不在1到8的范围内，返回行值范围错误
    elif not (row >= '1' and row <= '8'):
        return 'The row value is not in the range 1 to 8!'
    # 如果列和行值都在有效范围内，返回移动到指定位置的消息
    else:
        return f'The piece is moved to {column.upper()}{row}.'

# Test cases
print(check_move('B4'))  # 'The piece is moved to B4.'
print(check_move('b4'))  # 'The piece is moved to B4.'
print(check_move('I4'))  # 'The column value is not in the range a-h or A-H!'
print(check_move('F9'))  # 'The row value is not in the range 1 to 8!'
print(check_move('A'))   # 'The position is not valid.'

def check_move(position):
    if len(position) > 2 or len(position) < 2:
        return 'The position is not valid.'
    elif position[0].lower() in ['a','b','c','d','e','f','g','h'] and 1 <= int(position[1]) <= 8:
        return f'The piece is moved to {position[0].upper()}{position[1]}.'
    elif position[0].lower() not in ['a','b','c','d','e','f','g','h'] and 1 <= int(position[1]) <= 8:
        return 'The column value is not in the range a-h or A-H!'
    elif position[0].lower() in ['a','b','c','d','e','f','g','h'] and int(position[1]) not in (1,8):
        return 'The row value is not in the range 1 to 8!'

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