在给定行号的文本文件中打印行

Question

对于下面的问题，我无法使用while循环语句。这是给a的txt文件. 在

'Write a program that allows the user to navigate through the lines of text in any text file. The program prompts the user for a filename and copies the lines of text from the file into a list. The program then prints the number of lines in the file and prompts the user for a line number. Actual line numbers range from 1 to the number of lines in the file. If the input is 0, the program quits. Otherwise, the program prints the text in that line number.'

请看我的代码。在

enterfile = input("Enter the file name: ")
file = open(enterfile, 'r')
linecount = 0
for line in file:
    linecount = linecount + 1
print("The number of lines in this txt. file is", linecount)
linenum = 0
while True:
num = int(input("Please enter a line number or press 0 to quit: "))
if num >=1 and num <= linecount:
    file = open(enterfile, 'r')
    for lines in file:
        linenum = linenum + 1
        if linenum == num:
            print(lines)
else:
    if num == 0:
        print("Thanks for using the program")
        break

运行程序时，输入行号后行号不会打印。在

显然，我没有正确地使用while循环。有人能告诉我我做错了什么吗？我可以在这里使用def函数吗？在

谢谢！在

Answer 1

似乎你在输入后错过了作业的第一步

copies the lines of text from the file into a list

有了它，你就会

with open(enterfile) as f:
    lines = [line.rstrip() for line in f]
# continue on from here 

现在，忘记您有一个文件，您可以使用len(lines)和{}分别获得总行数和特定行数