python 执行 dos 命令
# 0x01 os.system(command)
[官方文档](https://docs.python.org/3.6/library/os.html#os.system)
# 0x02 os.popen(cmd, mode=’r’, buffering=-1)
[官方文档](https://docs.python.org/3.6/library/os.html#os.popen)
# 0x03 subprocess.call
## 3.1 (https://docs.python.org/3.6/library/subprocess.html#older-high-level-api)
* subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False, cwd=None, timeout=None)
* subprocess.check_call(args, *, stdin=None, stdout=None, stderr=None, shell=False, cwd=None, timeout=None)
* subprocess.check_output(args, *, stdin=None, stderr=None, shell=False, cwd=None, encoding=None, errors=None, universal_newlines=False, timeout=None)
## 3.2 (https://docs.python.org/3.6/library/subprocess.html#replacing-older-functions-with-the-subprocess-module)
## Replacing os.system()
```
sts = os.system("mycmd" + " myarg")
# becomes
sts = call("mycmd" + " myarg", shell=True)
```
# 0x04 subprocess.Popen
[官方文档](https://docs.python.org/3.6/library/subprocess.html#subprocess.Popen)
# 0x05 总结
简单说就是有的只能获取结果码，有的可以获取输入输出。
但是我的git clone 还是不能实现，应该是我没有仔细看文档，不想再复杂了。
```
cmd='git clone **项目'
print(os.system(cmd))# 0
print(os.popen(cmd).readlines())# []
print(subprocess.call(cmd,shell=True))# 0
print(subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
universal_newlines=True).stdout.readlines())# []
```
然后 help > ** 文件，都是成功的，但要注意 3.2 所说，shell=True，默认的False不能执行。
```
cmd='help > **文件'
print(os.system(cmd))# 1
print(os.popen(cmd).readlines())# []
print(subprocess.call(cmd,shell=True))# 1
print(subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
universal_newlines=True).stdout.readlines())# []
```
# 0x06 python 调用 os.system 输出乱码
感谢(http://blog.csdn.net/Wensent_H/article/details/77088623)
将全局编码设置了与系统一样即可。
> File > Settings > Editor > File Encodings > Global Encoding : GBK
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