%%writefile

# adapted from source link
%%writefile is used at the beginning of a Notebook cell to convert
it into an executable script

Suppose the following lines define a Notebook cell:
  
  >>> %%writefile myfile.py
  >>> def my_function():
        print("Hello from a function")
  >>> my_function()
  
Once you have run the cell, a script named "my_file.py" will be created
in the current directory. 
You can also specify a different path with the usual syntax:
  >>> %%writefile path/to/myfile.py 
where you will have to substitute "path/to/" with the actual path where
the script will be saved

Source: predictivehacks.com

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