为什么计数器代码每次计数都添加额外的行？

Question

这段代码有什么问题每次向上或向下计数时都会添加额外的行我怎样才能防止这种情况发生以及为什么会发生这种情况？

def counter(start, stop):
    x = start
    if start > stop:
        return_string = "Counting down: "
        while x >= stop:
            return_string += str(x)
            x = x-1 
            if start != stop:
                return_string += ","
            print(return_string)
    else:
        return_string = "Counting up: "
        while x <= stop:
            return_string += str(x)
            x = x + 1 
            if start != stop:
                return_string += ","
            print(return_string)
    return return_string

print(counter(1, 10)) # Should be "Counting up: 1,2,3,4,5,6,7,8,9,10"
print(counter(2, 1)) # Should be "Counting down: 2,1"
print(counter(5, 5)) # Should be "Counting up: 5"

Answer 1

使用这个：

def counter(start, stop):
    x = start
    if start > stop:
        return_string = "Counting down: "
        while x >= stop:
            return_string += str(x)
            x = x-1
            if start != stop:
                return_string += ","
        print(return_string)
    else:
        return_string = "Counting up: "
        while x <= stop:
            return_string += str(x)
            x = x + 1
            if start != stop:
                return_string += ","
        print(return_string)
    return return_string

Answer 2

def counter(start, stop):
    x = start 
    if x>stop:
        return_string = "Counting down: "
        while x >= stop:
            return_string += str(x) 
        if x>stop:
            return_string += "," 
            x = x - 1
        else:
            return_string = "Counting up: " 
            while x <= stop: 
                return_string += str(x) 
                if x<stop:
                    return_string += "," 
                    x = x + 1
        return return_string

Answer 3

使用这个：

def counter(start, stop):
x = start
if start > stop:
    return_string = "Counting down: "
    while x >= stop:
        return_string += str(x)
        x = x-1
        if x >= stop:
            return_string += ","
else:
    return_string = "Counting up: "
    while x <= stop:
        return_string += str(x)
        x = x + 1
        if x <= stop:
            return_string += ","
return return_string

Answer 4

def counter(start, stop):
    x = start
    if start > stop:
        return_string = "Counting down: "
        while x >= stop:
            return_string += str(x)
            if x != stop:
                return_string += ","
            x = x - 1

    else:
        return_string = "Counting up: "
    while x <= stop:
        return_string += str(x)
        if x != stop:
            return_string += ","
        x = x + 1

    return return_string

Answer 5

这是一个：

def counter(start, stop):
    x = start
    if start>stop:

        return_string = "\"Counting down: "
        while x >= stop:
            return_string += str(x)
            x=x-1
            if x>=stop:
                return_string += ","
        return_string += '"'
    else:
        return_string = "\"Counting up: "
        while x <= stop:
            return_string += str(x)
            x=x+1
            if x<=stop:
                return_string += ","
        return_string += '"'
    return return_string

Answer 6

您可以在此处使用此代码。这将打印出没有尾随逗号的结果。

def counter(start, stop):
x = start
if x > stop:
    return_string = "Counting down: "
    while x >= stop:
        return_string += str(x)
        x = x-1
        if start != stop:
            return_string += ","
            return_string.rstrip(',')
else:
    return_string = "Counting up: "
    while x <= stop:
        return_string += str(x)
        x = x + 1
        if start != stop:
            return_string += ","
return return_string.rstrip(',')

Answer 7

def counter(start, stop):
x = start
if start > stop:
    return_string = "Counting down: "
    while x >= stop:
        return_string += str(x)
        if x != stop :
            return_string += ","
        x -= 1
else:
    return_string = "Counting up: "
    while x <= stop:
        return_string += str(x)
        if x != stop:
            return_string += ","
        x += 1
return return_string

print(counter(1, 10)) # Should be "Counting up: 1,2,3,4,5,6,7,8,9,10"
print(counter(2, 1)) # Should be "Counting down: 2,1"
print(counter(5, 5)) # Should be "Counting up: 5"

Answer 8

#这行得通

def counter(start, stop):
    x = start
    if start > stop:
        return_string = "Counting down: "
        while x >= stop:
            return_string += str(x)
                if x != stop :
                    return_string += ","
                x = x - 1
        
    else:
         return_string = "Counting up: "
         while x <= stop:
             return_string += str(x)
             if x != stop:
                   return_string += ","
             x = x + 1
        
    return return_string

Answer 9

def counter(start, stop):
    x = start
    if x> stop:
        return_string = "Counting down: "
        while x >= stop:
            return_string += str(x)
            if x >= stop:
                return_string += ","
            x-=1
   else:
        return_string = "Counting up: "
        while x <= stop:
           return_string += str(x)
        
            if x <= stop:
                return_string += ","
            x+=1
    return return_string

为什么计数器代码每次计数都添加额外的行？

why counter code add extra line every count?

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