Read a File¶
files are strings that are stored on disk
we normally access them by using a path which describes their location
to work with the strings inside we use the
>>> path = 'trivia/questions.csv' >>> file_handle = open( path, 'r') >>> file_handle <_io.TextIOWrapper name='trivia/questions.csv' mode='r' encoding='UTF-8'>
we can treat a file like a list of lines (in some ways)
>>> for line in file_handle: ... print(repr(line)) 'What is RAM?|Memory|Female Sheep|Baby Sheep|Forgotten Sheep\n' 'What is Python?|Language|Poisonous Snake|French Comedy Troupe|Quebecois Comedy Troupe\n' 'How many bits in a byte?|8|32|64|4|2|10|100\n' 'Who was the first Prime Minister of Canada?|Sir John Alexander Macdonald|Lester B. Pearson|Guglielmo Marconi|Avril Lavigne|Pierre Elliott Trudeau\n' ... >>> for line in file_handle: ... print(repr(line)) >>> # HUH? why not?
the file has a position and as you iterate over it that position moves through the file
once you reach the end of the file, you can’t (easily) re-iterate over it
repr() produces a code-like “representation” of an object,
we use it here so that we can see what the resulting object is clearly.
Exercise: Iterate Over a File¶
Create a new script that opens your questions.txt file and prints every line
Why are there blank lines?
Modify your script to not show blank lines (hint String Manipulations)