How to fix this bug?

Question

Python

There is a code:

if __name__ == "__main__":
  path = input('Введите имя файла:')
  a = open(path)
  act = input('Какое действие хотите выполнить с файлом? \n 1. Подсчитать кол-во строк \n 2. Подсчитать кол-во символов в файле \n 3. 1 + 2: ')
  
def countLines(name):
  count = 0
  for l in name.readlines():
    count += 1
  return count
def countChars(name):
  b = len(name.read())
  return b
def test(name):
  print(countLines(name))
  print(countChars(name))
  return "Done"
  
if __name__ == "__main__":
  if act == "1":
    print(countLines(a))
  elif act == "2":
    print(countChars(a))
  elif act == "3":
    print(test(a))
  else:
    print("Ошибка")

3 action works only half way, performing the first function. How to fix this defect?

Answer 1

When you have counted the lines in a file, you have read it to the end. After that, the call to read() will return EOF, i.e. in fact, no more characters can be read. To read the file again, you need to call seek(0) (well, or write another method that counts both lines and characters at the same time).