> For the complete documentation index, see [llms.txt](https://kawsing.gitbook.io/opensystem/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kawsing.gitbook.io/opensystem/yun-suan-si-wei/python-install-on-windows/start-cheng-shi.md).

# Start 程式

```python
# -*- coding: utf-8 -*-
#這是向世界打招呼
print("hello world")
```

```python
# -*- coding: utf-8 -*-
#這是向世界打招呼
#載入 os 模組
import os
print("hello world") #內建命令
os.system("echo hello world") #使用os模組呼叫shell
```

簡單工具

```
>>> import re
>>> demo = " Demo  Example  "
>>> demo.replace(" ", "")
'DemoExample'
```

```python
import re
def stripFile(oldFname,newFname):
    '''移除原始檔案所有空白，輸出新檔案'''
    fp = open(oldFname,"r+",encoding="utf-8")
    newFp = open(newFname,"w",encoding="utf-8")
    for eachline in fp.readlines():
        newStr = eachline.replace(" ","").replace("\t","").strip()+"\n"
        newFp.write(newStr)
    fp.close()
    newFp.close()
if __name__ == "__main__":
    oldName = input("輸入原始檔案名稱:")
    nameList = oldName.split(".")
    newName = "%s%s%s" % (nameList[0],"_new.",nameList[1])
    stripFile(oldName,newName)
    print("輸出新檔案:",newName)
```