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Generator v list comparison
Functions, Modules and Packages example from a Well House Consultants training course
More on Functions, Modules and Packages [link]
Source code: jenny Module: Y105
# This function reads thje whole file and passes it back as a list def datareader(fname): fh = open(fname) stuff = [] while True: lyne = fh.readline() if not lyne: break print("getting") stuff.append(lyne) fh.close() return stuff # But This function reads the file line by line and passes each back as it runs def xdatareader(fname): fh = open(fname) while True: lyne = fh.readline() if not lyne: break print("getting") yield lyne fh.close() # Read it all, then process it all for item in datareader("places.xyz"): print("processing") print(item,end=" ") # Production line - read one, process one print("-" * 50) # Separator on output for item in xdatareader("places.xyz"): print("processing") print(item, end=" ") """ Sample Output WomanWithCat:y105 grahamellis$ python3 jenny getting getting getting getting getting getting getting getting getting processing #%% Sample data for jenny demo processing Melksham Ruby Perl Python Tomcat processing Lymington Python processing Plymouth Python processing Cambridge Perl Python processing Bristol Python processing Norwich Tomcat processing Reading Lua processing London Perl -------------------------------------------------- getting processing #%% Sample data for jenny demo getting processing Melksham Ruby Perl Python Tomcat getting processing Lymington Python getting processing Plymouth Python getting processing Cambridge Perl Python getting processing Bristol Python getting processing Norwich Tomcat getting processing Reading Lua getting processing London Perl WomanWithCat:y105 grahamellis$ """ Learn about this subject
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