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# 打印正方形
for i in range(20):
if i % 2 == 0:
print("*", end="")
else:
print(" ", end="")
print()
for j in range(8):
for i in range(20):
if i == 0:
print("*", end="")
elif i == 18:
print("*")
break
else:
print(" ", end="")
for i in range(20):
if i % 2 == 0:
print("*", end="")
else:
print(" ", end="")

for i in range(20):
# 以空格隔开,刚好打印*的位置是i偶数的位置,i奇数的位置打印空格
if i % 2 == 0:
print("*", end="")
else:
print(" ", end="")
# 要记得加入这句话,换行,上面的代码运行完毕不会换行
print()
for j in range(8):
for i in range(20):
if i == 0:
print("*", end="")
elif i == 18:
print("*")
break
else:
print(" ", end="")
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