Homework 04: Initial Import

homework04/cut.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+
+''' cut.py - remove sections from each line of stream '''
+
+import io
+import sys
+
+# Functions
+
+def usage(exit_status: int=0) -> None:
+    ''' Print usage message and exit. '''
+    print('''Usage: cut -d DELIMITER -f FIELDS
+
+Print selected parts of lines from stream to standard output.
+
+    -d DELIMITER    Use DELIM instead of TAB for field delimiter
+    -f FIELDS       Select only these fields''', file=sys.stderr)
+    sys.exit(exit_status)
+
+def strs_to_ints(strings: list[str]) -> list[int]:
+    ''' Convert all strings in list to integers.
+
+    >>> strs_to_ints(['2', '4'])
+    [2, 4]
+    '''
+    pass
+
+def cut_line(line: str, delimiter: str='\t', fields: list[int]=[]) -> list[str]:
+    ''' Return selected fields from line separated by delimiter.
+
+    >>> cut_line('Harder, Better, Faster, Stronger', ',', [2, 4])
+    [' Better', ' Stronger']
+    '''
+    pass
+
+def cut_stream(stream=sys.stdin, delimiter: str='\t', fields: list[int]=[]) -> None:
+    ''' Print selected parts of lines from stream to standard output.
+
+    >>> cut_stream(io.StringIO('Harder, Better, Faster, Stronger'), ',', [2, 4])
+     Better, Stronger
+    '''
+    pass
+
+# Main Execution
+
+def main(arguments=sys.argv[1:], stream=sys.stdin) -> None:
+    ''' Print selected parts of lines from stream to standard output.
+
+    This function will parse the command line arguments to determine the
+    delimiter and which fields to select from each line.
+
+    >>> main('-d , -f 2,4'.split(), io.StringIO('Harder, Better, Faster, Stronger'))
+     Better, Stronger
+    '''
+    # Parse command line arguments
+    pass
+
+    # Cut stream with delimiter and fields
+    pass
+
+if __name__ == '__main__':
+    main()
+
+# vim: set sts=4 sw=4 ts=8 expandtab ft=python: