Why are the results of this program like this?-CodePudding

cubeclick = "b"

def clicksave(type):
    clickcheck = ["", "", ""]
    for i in range(type):
        if cubeclick != clickcheck[i-1]:
            clickcheck[i] = cubeclick
        elif clickcheck[0] == "":
            if cubeclick != "":
                clickcheck[0] = cubeclick
            else:
                while cubeclick == "":
                    pass
                continue
    return clickcheck

print(clicksave(3))

This code treats incoming connections from three sides of the cube as A, B, and C, respectively, and returns them in a list format. But the results are not good.

['b', '', 'b']

Why are the results of this program like this?

CodePudding user response：

cubeclick = "b"

def clicksave(type):
    clickcheck = ["", "", ""]
    for i in range(type):
        if cubeclick != clickcheck[i]:
            clickcheck[i] = cubeclick
            print(clickcheck[i])
        elif clickcheck[0] == "":
            if cubeclick != "":
                clickcheck[0] = cubeclick
                print(clickcheck[0])
            else:
                while cubeclick == "":
                    pass
                continue
    return clickcheck

print(clicksave(3))

Try this

CodePudding user response：

If you unroll the loop and replace cubeclick with "b", you see why the results are like that:

clickcheck = ["", "", ""]

if "b" != clickcheck[-1]: # true
    clickcheck[0] = "b" # Do this
elif clickcheck[0] == "":
    if "b" != "":
        clickcheck[0] = "b"
# The else: branch never does anything.

# clickcheck is ["b", "", ""]

if "b" != clickcheck[0]: # false
    clickcheck[1] = "b"
elif clickcheck[0] == "": # true
    if "b" != "": # true
        clickcheck[0] = "b" # Do this

# clickcheck is still ["b", "", ""]
        
if "b" != clickcheck[1]: # true
    clickcheck[2] = "b" # Do this
elif clickcheck[0] == "":
    if "b" != "":
        clickcheck[0] = "b"

# clickcheck is ["b", "", "b"]

It's very difficult to give any advice about how to change anything, as it is very unclear what the result is supposed to be.