如何让这个程序循环直到我输入“停止”

Question

我似乎无法让程序继续运行，直到我输入“停止”命令。我下面有这个新代码，可以按照我的需要将字母打印为星形图案，但我需要它继续下去，直到我输入“停止”。

def pattern():
    for i in range(len(name)):
        if name [i] =="B":
            print_B = [[" " for i in range (5)] for j in range (5)]
            for row in range(5):
                for col in range(5):
                    if (col==0) or (col==4 and (row!=0 and row!=2 and row!=4)) or ((row==0 or row==2 or row==4) and (col>0 and col<4)):
                        print_B[row] [col] = "*"
            list2.append(print_B)
                    
        elif name [i] =="A":
            print_A = [[" " for i in range (5)] for j in range (5)]
            for row in range(5):
                for col in range(5):
                    if (row==0 and 1<col<3)or((row==1 and 0<col<2)or(row==1 and 2<col<4))or(row==2 and 0<=col)or((row==3 or row==4) and (0<=col<1 or 3<col>=4)):
                        print_A[row] [col] = "*"
            list2.append(print_A)
        
        elif name [i] =="L":
            print_L = [[" " for i in range (5)] for j in range (5)]
            for row in range(5):
                for col in range(5):
                    if ((col==0) and row<=4) or ((row==4) and (0<col<=4)):
                        print_L[row] [col] = "*"
            list2.append(print_L)
        else:
            print("INVALID")
            
    return list2

name = input("Enter the name:")
list2 = []
list3 = pattern()

for i in range (5):
    for j in range(len(list3)):
        for k in range(5):
            print(list3[j][i][k],end=" ")
        print(end=" ")
    print ()

我知道这是相当简单的事情，但我希望能帮助解决这个问题，并且如果可能的话，我希望对添加的每段代码的作用有一个基本解释。

谢谢。

我知道我需要从...开始

def information_gathering_phase():
    while True:  
        word = input("Enter a word from the letters 'B', 'A' and/or 'L' (or type 'stop' to stop the program): ") 
        if word == 'stop' or word == 'STOP': 
            return None 
        elif not all(letter in 'BAL' for letter in word): 
            print("Invalid word! Please try again...") 
        else:
            return word 

并以类似...的方式结束

def main():
    while True:
        word = information_gathering_phase()
        if word is None: 
            print("Thanks for trying my program...Bye for now!")
            break 
        else:
            ??? I don't know - ? some return statement

if __name__ == '__main__': 
    main()

但我似乎无法将新旧融合在一起。

Answer 1

您需要一个 while 循环，当/如果用户输入单词“STOP”时终止。

您还需要采用不同的方法来呈现用户输入。将输入限制为仅由字母 B、A 和 L 组成的单词是相当有限的。

你可以这样做：

matrix = {
    "A": [" *** ", "*   *", "*****", "*   *", "*   *"],
    "B": ["**** ", "*   *", "**** ", "*   *", "**** "],
    "C": [" ****", "*    ", "*    ", "*    ", " ****"],
    "D": ["**** ", "*   *", "*   *", "*   *", "**** "],
    "E": ["*****", "*    ", "*****", "*    ", "*****"],
    "F": ["*****", "*    ", "*****", "*    ", "*    "],
    "G": [" ****", "*    ", "* ***", "*   *", " ****"],
    "H": ["*   *", "*   *", "*****", "*   *", "*   *"],
    "I": ["*****", "  *  ", "  *  ", "  *  ", "*****"],
    "J": ["*****", "  *  ", "  *  ", "* *  ", " *   "],
    "K": ["*  * ", "* *  ", "**   ", "* *  ", "*  * "],
    "L": ["*    ", "*    ", "*    ", "*    ", "*****"],
    "M": ["*   *", "** **", "* * *", "*   *", "*   *"],
    "N": ["*   *", "**  *", "* * *", "*  **", "*   *"],
    "O": [" *** ", "*   *", "*   *", "*   *", " *** "],
    "P": ["**** ", "*   *", "**** ", "*    ", "*    "],
    "Q": [" *** ", "*   *", "*   *", "* * *", " ****"],
    "R": ["**** ", "*   *", "**** ", "* *  ", "*  * "],
    "S": [" ****", "*    ", " ****", "    *", "**** "],
    "T": ["*****", "  *  ", "  *  ", "  *  ", "  *  "],
    "U": ["*   *", "*   *", "*   *", "*   *", " *** "],
    "V": ["*   *", "*   *", "*   *", " * * ", "  *  "],
    "W": ["*   *", "*   *", "* * *", "** **", "*   *"],
    "X": ["*   *", " * * ", "  *  ", " * * ", "*   *"],
    "Y": ["*   *", " * * ", "  *  ", "  *  ", "  *  "],
    "Z": ["*****", "   * ", "  *  ", " *   ", "*****"],
    " ": ["     ", "     ", "     ", "     ", "     "],
    ".": ["     ", "     ", "     ", "   * ", "     "],
    ",": ["     ", "     ", "   * ", "  *  ", "     "],
    "!": [" *   ", " *   ", " *   ", "     ", " *   "],
    "?": [" *** ", "   * ", "  *  ", "     ", "  *  "],
    "'": [" *   ", " *   ", "     ", "     ", "     "],
    '"': [" * * ", " * * ", "     ", "     ", "     "],
    "-": ["     ", "     ", " *** ", "     ", "     "],
    "_": ["     ", "     ", "     ", " *** ", "     "],
    "0": [" *** ", "*   *", "*   *", "*   *", " *** "],
    "1": ["   * ", "  ** ", "   * ", "   * ", "   * "],
    "2": [" *** ", "   * ", " *** ", "*    ", " *** "],
    "3": [" *** ", "   * ", " *** ", "   * ", " *** "],
    "4": ["*   *", "*   *", "*****", "    *", "    *"],
    "5": ["*****", "*    ", "**** ", "   * ", "**** "],
    "6": [" *** ", "*    ", "**** ", "*  * ", " *** "],
    "7": ["*****", "   * ", "  *  ", " *   ", "*    "],
    "8": [" *** ", "*  * ", " *** ", "*  * ", " *** "],
    "9": [" *** ", "*  * ", " ****", "   * ", " *** "],
    "(": ["  *  ", " *   ", "*    ", " *   ", "  *  "],
    ")": [" *   ", "  *  ", "   * ", "  *  ", " *   "],
}


def pattern(word):
    return [["".join(matrix[c][i]) for c in word] for i in range(5)]


while (word := input("Enter a word or STOP to end the program: ").upper()) != "STOP":
    if word and all(c in matrix for c in word):
        for row in pattern(word):
            print(" ".join(row))
    else:
        print("Invalid word")

Answer 2

只需使用一个循环并检查您的名称是否为 stop 来打破它

while True:
  name = input("Enter the name:")
  if name.lower() == "stop":
      break
  
  # your normal program execution
  list2 = []
  list3 = pattern()