“createlist”函数中“kapfun（i）”行的语法错误无效

Question

我在kapfun(i)函数的createlist行继续收到无效的语法错误。谁能告诉我为什么？

def createlist(i):
    n=i
    global n
    a=n[0:1]
    b=n[1:2]
    c=n[2:3]
    d=n[3:4]
    n=[int(a),int(b),int(c),int(d)

    kapfun(i)
    return i

def kapfun(i):                  
    print(i)
    kaprekar=down(i)-up(i)    
    return kaprekar

def integer(numList):                              
    integer= ''.join(map(str, numList))
    return int(integer)

def up(n):                                   
    n.sort()
    up=n 
    up=integer(up)

    return up

def down(n):                    
    print(n)
    n.reverse()
    down=n
    down=integer(down)

    return down

def kaprekarfunction(i):               
    createlist(i)
    print (i)
    kapfun(i)
    print (i)
    return i

x="1234"
createlist(x)
print(x)

Answer 1

您错过了上一行列表末尾的括号。它应该是：

n=[int(a),int(b),int(c),int(d)]