Python实现动态进度条

★ 进度条基本实现

• 功能代码

  import sys
  import time
  
  # 进度条-功能演示
  def progress_bar_demo(title, symbol):
      for per in range(1, 101):
          print("\r", end="")
          print(f"【{title}】: {per}%: {symbol * (per // 2)} ", end="")
          sys.stdout.flush()
          time.sleep(0.1)
      print("Complete !!!")
     
  # 进度条效果演示
  progress_bar_demo("Download progress", "▋")
  

★ 进度条应用版

• 功能代码

  import sys
  import time
  
  # 进度条应用版
  class ProgressBar:
  
      def __init__(self, title, symbol):
          self.title = title
          self.symbol = symbol
          # 记录生成器状态
          self.is_stop = False
          # 获取一个进度条生成器对象
          self.process = self._process()
          # 启动生成器
          next(self.process)
  
      # 返回进度条状态 True 表示进度条已结束
      def update_process(self, percent):
          if self.is_stop:
              return True
  
          # 数据校验
          if percent < 0:
              percent = 0
          elif percent > 100:
              percent = 100
          percent = int(percent)
  
          # 更新进度条与状态
          try:
              self.process.send(percent)
          except StopIteration:
              self.is_stop = True
  
          return False
  
      def _process(self):
          while True:
              percent = yield
  
              print("\r", end="")
              print(f"【{self.title}】: {percent}%: {self.symbol * (percent // 2)} ", end="")
              sys.stdout.flush()
  
              if percent >= 100:
                  print("Complete !!!")
                  break
                  
  # 模拟文件总数和处理完成的文件数
  total_num = 125
  complete_num = 0
  
  pb = ProgressBar("Download progress", "▋")
  while True:
      # 模拟文件处理耗时
      time.sleep(0.1)
      complete_num += 1
  
      is_over = pb.update_process(complete_num / total_num * 100)
      if is_over:
          break
  

• 运行效果