Python中if语句问题

Question

如下代码中，语句if i == 0 and j == 0:和语句elif j == 0:难道不冲突吗？j == 0的情况也包含中i == 0 and j == 0吧？

size = int(input("请输入棋盘的大小："))
for i in range(size):
    for j in range(size):
        if i == 0 and j == 0:
            print("┏",end='')
        elif i == 0 and j == size - 1:
            print("┓",end='')
        elif i == size - 1 and j == 0:
            print("┗",end='')
        elif i == size - 1 and j == size - 1:
            print("┛",end='')
        elif j == 0:
            print("┠",end='')
        elif i == size - 1:
            print("┷",end='')
        elif j == size - 1:
            print("┨",end='')
        elif i == 0:
            print("┯",end='')
        else:
            print("┼",end='')
    print('')

Answer 1

不冲突的，如果只是i ==0满足条件，但是j不满足条件的话，不会执行if，执行的是elif i==0

size = int(input("请输入棋盘的大小："))
for i in range(size):
    for j in range(size):
        if i == 0 and j == 0:
            print("┏",end='')     
        elif j == 0:
            print("┠",end='')
        elif i == 0:
            print("┯",end='')
        else:
            print("┼",end='')
    print('')

分析一下有疑问的分支。
1)当i =0,j不等于0时，执行elif i == 0:分支
1)当i 不等于0,j=0时，执行elif j == 0:分支
1)当i =0,j=0时，执行if i == 0 and j == 0分支