我要“编写一个python程序,提示用户输入一个正整数n。程序然后打印一个有n行和2 * n列的空心矩形。例如,输入3将输出:”
******
* *
******
我的代码是:
n=int(input('Please enter a positive integer between 1 and 15: '))
for col in range(n):
for row in range(n):
print('*' if col in(0,(2*n)+1) or row in(0,n+1) else ' ', end=' ')
print()
但我的输出并不像我需要的那样;它就像一个空心盒子的上半部分和左半部分。另外,我没有得到像我需要的双列。我做错了什么?
编辑:谢谢大家的帮助!给了我很多洞察力,非常有帮助。我将我的代码修改为以下内容,并且效果非常好:>n=int(input('Please enter a positive integer between 1 and 15: '))
>for row in range(n):
> for col in range(2*n):
> print('*' if row in(0,n-1) or col in(0,(2*n)-1) else ' ', end=' ')
> print()
特别关注user2357112;你让我意识到我绊倒了什么。
答案 0 :(得分:0)
代码应该是:
line = "*"*(2*n)
print line
s = "*" + " "*(n-2) + "*"
for i in range(n-2):
print s
print line
该行:
"*"*(2*n)
指定字符串“*”,重复2 * n次。你想要2 * n列右..这打印2 * n“*”
答案 1 :(得分:0)
<强>代码:强>
def printStars(length):
l = ['*'*length]
l+= ['*' + ' '*(length-2) + '*'] * (length-2)
l+= ['*'*length]
return l
if __name__=='__main__':
print('\n'.join(printStars(15)))
输出
***************
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
***************
希望这会有所帮助:)
编辑:修正了一些格式
答案 2 :(得分:0)
def make_box():
size = int(input('Please enter a positive integer between 1 and 15: '))
for i in range(size):
if i == 0 or i == size - 1:
print("*"*(size+2))
else:
print("*" + " "*size + "*")
make_box()
输出(n = 15)
*****************
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
*****************
答案 3 :(得分:0)
我的解决方案:
# Response to StackOverflow post:
# Making a hollow box in Python
# The multiplication operator (*) is the same as repeated
# concatenation when applied to strings in Python.
# I solved the problem by creating an array with N elements
# and gluing them together (str.join(array)) with newline
# characters.
# I trust you're already familiar with string formatting and
# concatenation, but in case you're not, please feel free to
# ask for clarification.
def main():
n = int (input("Enter an integer between 1 and 15"))
box = "\n".join(["*"*(2*n)] + ["*%s*" % (" "*(2*n-2))]*(n-2) + ["*"*(int(n>1)*2*n)])
print (box)
if __name__ == '__main__':
main()
input() # Prevents the console from closing immediately
至于你的解决方案。在我看来,循环条件搞砸了;列和行循环的顺序相反,列循环中range()的参数应为2 * n(因为这是每行相交的列数)。您还应该再次查看第一个打印语句中的条件。
答案 4 :(得分:0)
我的解决方案比较基础。请考虑一下:
row = abs(eval(input('Enter row: ')))
col = abs(eval(input('Enter column: ')))
print ('*'*col)
for i in range (row-2):
print ('*'+' '*(col-2)+'*')
print ('*'*col)