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• Here is how can you make Python codes to suggest file type based on its header and MIME type using Python - Magic library.
• Check here for StackOverflow documentation, http://stackoverflow.com/questions/10937350/how-to-check-type-of-files-without-extensions-in-python.
• Check here for Python - Magic GitHub repository, https://github.com/ahupp/python-magic.
• Here are some examples.

import magic

magic.from_file("iceland.jpg")
# Example output "JPEG image data, JFIF standard 1.01".

magic.from_file("iceland.jpg", mime=True)
# Example output "image/jpeg".

magic.from_file("greenland.png")
# Example output "PNG image data, 600 x 1000, 8-bit colormap, non-interlaced".

magic.from_file("greenland.png", mime=True)
# Example output "image/png".

• How to get the latest folder in a string formatted path.
• StackOverflow discussion, http://stackoverflow.com/questions/3925096/how-to-get-only-the-last-part-of-a-path-in-python.

os.path.basename(os.path.normpath("/folderA/folderB/folderC/folderD/"))
# Example output "folderD".

• Example Python codes to exchange the value between array elements.
• StackOverflow discussion, http://stackoverflow.com/questions/2493920/how-to-switch-position-of-two-items-in-a-python-list.

i = ["title", "email", "password2", "password1", "first_name", "last_name", "next", "newsletter"]
a, b = i.index("password2"), i.index("password1")
i[b], i[a] = i[a], i[b]

• Example of getting specific sub - string from a string in Python.
• StackOverlfow link, http://stackoverflow.com/questions/3486384/output-first-100-characters-in-a-string/3486387

# To get the first 100 characters from myString variable.
# Returned as a string.
myString[:100]
# To get the last 100 characters from myString variable.
# Returned as a string.
myString[:-100]

• Here is a code to make sure a string is only alphabets and number. No other characters.
• The key here is to use isalnum().
• StackOverflow discussion, http://stackoverflow.com/questions/5843518/remove-all-special-characters-punctuation-and-spaces-from-string.

string = "Special $#! characters   spaces 888323"
"".join(e for e in string if e.isalnum())