基于python实现生成指定大小txt文档

"""
 * Create by dell on 2020/7/10
 * Author ：wencheng
 * 微信公众 ：自动化测试 To share
"""
# !/user/bin/env python
# -*- coding:utf-8 -*-

import os
import time


# 获取username, 如chinaren
def getusername():
  namelist = os.popen('echo %username%').readlines()
  username = namelist[0].replace("\n", "")
  # 获取当前的username
  return username


# 获取时间和日期
def getnowdatatime(flag=0):
  '''
  flag = 0为时间和日期     eg:2018-04-11 10:04:55
  flag = 1仅获取日期      eg:2018-04-11
  flag = 2仅获取时间      eg:10:04:55
  flag = 3纯数字的日期和时间  eg:20180411100455
  '''
  now = time.localtime(time.time())
  if flag == 0:
    return time.strftime('%Y-%m-%d %H:%M:%S', now)
  if flag == 1:
    return time.strftime('%Y-%m-%d', now)
  if flag == 2:
    return time.strftime('%H:%M:%S', now)
  if flag == 3:
    return time.strftime('%Y%m%d%H%M%S', now)


# 生成指定大小的TXT档
def generateTXTFile():
  fileSize = 0
  # 判断输入是否有误
  while True:
    size = input('请输入你想生成的TXT文件大小(MB):')
    if size.strip().isdigit() != True:
      print('只能输入整数，请重新输入!')
      continue
    else:
      fileSize = int(size)
      break
  if fileSize >= 200:
    print('正在生成TXT文件，请稍候... ...')
  # 生成指定大小的TXT档
  filename = getnowdatatime(3) + '_' + size + 'MB.txt'
  print(f'文件名：{filename}')
  # 设置文件保存的路径
  filepath = 'C:\\Users\\' + getusername() + '\\Desktop\\'
  f = open(filepath + filename, 'w')
  # 获取开始时间
  starttime = getnowdatatime()
  startclock = time.clock()
  for i in range(fileSize):
    if i >= 100:
      if i % 100 == 0:
        print(f'已生成{i//100 * 100}MB数据.')
    for j in range(1024):
      try:
        f.write('01' * 512)
      except KeyboardInterrupt:
        print('\n异常中断:KeyboardInterrupt')
        f.close()
        exit(-1)
  f.close()
  print(f'文件已成生并保存在桌面, 文件大小:{fileSize}MB.\n')
  print(f'DetailInfo:')
  print(f'保存路径: {filepath + filename}')
  print(f'开始时间:{starttime}')
  print(f'结束时间:{getnowdatatime()}')
  print(f'总共耗时:{(time.clock() - startclock):<.3}sec.')


if __name__ == '__main__':
  generateTXTFile()