User-defined Functions:gcufbioinfo

Here is the process for creating your own function in Python. The first line begins with the keyword def, is followed by the name of the function and any arguments (expected input values) surrounded by parentheses, and ends with a colon. Subsequent lines make up the body of the function and must be indented. If a string comment appears in the first line of the body, it becomes part of the documentation for the function. The last line of a function returns a result.
Let's define some functions in the PyCrust shell. Then we can try each function with some sample data and see the result returned by the function.

>>> def transcribe(dna): 
...     """Return dna string as rna string.""" 
...     return dna.replace('T', 'U') 
...      
>>> transcribe('CCGGAAGAGCTTACTTAG') 
'CCGGAAGAGCUUACUUAG'