Python sys模块

Python sys模块

sys模块

用于提供对解释器相关的操作

sys.argv          
    # 命令行参数List，第一个元素是程序本身路径
     
sys.exit(n)       
    # 退出程序，正常退出时exit(0)
     
sys.version       
    # 获取Python解释程序的版本信息
     
sys.maxint        
    # 最大的Int值
     
sys.path          
    # 返回模块的搜索路径，初始化时使用PYTHONPATH环境变量的值
     
sys.platform      
    # 返回操作系统平台名称
     
sys.stdout.write('please:')
val = sys.stdin.readline()[:-1]

测试脚本

import sys

print(sys.stdout.write("please:"))  # 进度条使用
val = sys.stdin.readline()[:-1]  # 读取键盘的一次输入
print(sys.platform)  # 返回操作系统平台名称
print(sys.path)  # 返回模块的搜索路径
print(sys.version)  # 获取Python解释程序的版本信息
print(sys.argv)  # 命令行参数List，第一个元素是程序本身路径

# 输出结果
please:7

darwin
['/Users/evescn/Documents/GitHub/python', '/Users/evescn/Documents/GitHub/python', '/Applications/PyCharm.app/Contents/plugins/python/helpers/pycharm_display', '/Users/evescn/.conda/envs/python/lib/python310.zip', '/Users/evescn/.conda/envs/python/lib/python3.10', '/Users/evescn/.conda/envs/python/lib/python3.10/lib-dynload', '/Users/evescn/.conda/envs/python/lib/python3.10/site-packages', '/Applications/PyCharm.app/Contents/plugins/python/helpers/pycharm_matplotlib_backend']
3.10.11 (main, May 15 2023, 19:29:30) [Clang 14.0.6 ]
['/Users/evescn/Documents/GitHub/python/1.py']

进度条功能实现

import sys, time

for i in range(20):
    sys.stdout.write("#")
    sys.stdout.flush()
    time.sleep(0.1)

import time

def progress(precent, width=50):
    if precent > 1:
        precent = 1
    show_str = ('[%%-%ds]' % width) % ('#' * int(precent * width))
    print('\r%s %d%%' % (show_str, int(precent * 100)), end="")


recv_size = 0
total_size = 1231234
while recv_size < total_size:
    time.sleep(0.1)
    recv_size += 1024
    progress(recv_size / total_size)

### 运行结果 ###
[#############                                     ] 27%