Reading files line by line
18-minute lesson · module-files-02
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Reading files line by line
18-minute lesson · module-files-02
- Read an entire file with `.read()` and a list of lines with `.readlines()`.
- Iterate a file object directly to process one line at a time.
- Strip the trailing newline from each line with `.strip()`.
- Convert text lines into numbers and aggregate them.
Source attribution
Status: adapted
How to Think Like a Computer Scientist: Interactive Edition — source · Files / Reading a File / Iterating over lines / Alternative File Reading Methods
Adaptation notes. Reading rewritten in our voice. The scores-file example is ours. The coding exercise takes a path argument and the test creates the input file in /tmp first, so it runs identically in Pyodide and a local subprocess.
License notes. Original chapter is GNU FDL 1.3 (Brad Miller, David Ranum, and the upstream Elkner/Downey/Meyers text). No verbatim text reproduced.