isSQLite3.py

Python - isSQLite3.py

def isSQLite3(filename: str) -> bool:
```
I needed this function because the `connect` function of the `sqlite3` python module DOES NOT, 
and I repeat DOES NOT, verify that the file passed as a parameter is really an sqlite3 database file!

If you open grandma's soup recipe in recipe.txt the `connect` function will not raise an error!!!

The only way I found to REALLY determine if a file is, or isn't, an sqlite3 dbase file, is the following
method:

IF the first 16 bytes match the string b'SQLite format 3\x00' then it REALLY is a sqlite3 file!!
```


from os.path import isfile, getsize

  if not isfile(filename):
		return False
	
	if getsize(filename) < 100: # SQLite database file header is 100 bytes long
		return False

  with open(filename, 'rb') as fd:
		header = fd.read(100)
		if (header[:16] == b'SQLite format 3\x00'):
			return True
 		else:
      return False