use Path from pathlib

hughlilly · hughlilly · commit 71ca4850f65f · 2022-02-04T08:39:50.000+13:00
diff --git a/07-files/files4.py b/07-files/files4.py
@@ -1,10 +1,22 @@
 
-# You can also use the `readlines()` method to iterate over the lines of a file
+# Use the Path class from pathlib to create OS-agnostic file paths
+from pathlib import Path
 
-filepath = r'07-files/shopping_list.csv'
+# Create a Path subclass object that starts in this directory
+files_dir = Path('./07-files')
 
-print(f"\nContents of {filepath}:\n")
+# Append the name of the file we want to work with using slash notation
+filepath = files_dir / 'shopping_list.csv'
 
+print(f"\nContents of {filepath.absolute()}:\n")
+
+# Use `readlines()` to iterate over the lines of the file
 with open(filepath) as file:
     for line in file.readlines():
         print(line, end='')
+
+
+
+# Pathlib can do all sorts of things -- make directories, check if a path is
+# a file or a directory, list the contents of directories, and more:
+# https://rednafi.github.io/digressions/python/2020/04/13/python-pathlib.html
diff --git a/07-files/files5.py b/07-files/files5.py
@@ -1,15 +1,18 @@
 
-# This time let's open a file for appending.
 
-# Define file path with an "r"-string
-filepath = r'07-files/soliloquy.txt'
+# This time let's append to a file. By default files are opened for reading,
+# in "text" mode. More: https://riptutorial.com/python/example/978/file-modes
+
+from pathlib import Path
+files_dir = Path('./07-files')
+filepath = files_dir / 'soliloquy.txt'
 
 new_lines = ["To sleep, perchance to dream; ay, there's the rub;",
              "For in that sleep of death what dreams may come",
              "When we have shuffled off this mortal coil,",
              "Must give us pause."]
 
-# Open for reading
+# Open for reading; note the variable name given to the file object
 with open(filepath, mode='r') as reader:
 
     # Enumerate over the file, but do nothing ("pass") with its contents
@@ -37,4 +40,4 @@
     for line_num, line in enumerate(reader, start=1):
         print(line_num, line, end='')
 
-print(f"\nWrote {len(new_lines)} extra lines.")
+print(f"\nWrote {len(new_lines)} extra lines.\n")
diff --git a/07-files/files6.py b/07-files/files6.py
@@ -0,0 +1,2 @@
+
+# CSVs
diff --git a/07-files/files7.py b/07-files/files7.py
@@ -0,0 +1,2 @@
+
+# Compare CSVs
