Add examples for reading files

Signed-off-by: Christopher Arndt <chris@chrisarndt.de>

beispiele/readfile1.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+
+import sys
+
+filename = sys.argv[1]
+
+with open(filename, "rb") as fileobj:
+    data = fileobj.read()
+
+num_bytes = len(data)
+
+print(f"The file contents are {num_bytes} long.")

beispiele/readfile2.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+
+import sys
+
+filename = sys.argv[1]
+
+with open(filename, "r") as fileobj:
+    data = fileobj.read()
+
+    max_linelength = 0
+    for line in data.splitlines():
+        max_linelength = max(max_linelength, len(line))
+
+print(f"The longest line has a length of {max_linelength}.")

beispiele/readfile3.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+
+import sys
+
+filename = sys.argv[1]
+
+with open(filename, "r") as fileobj:
+    max_linelength = 0
+    longest_line = -1
+
+    for i, line in enumerate(data):
+        if len(line) > max_linelength:
+            max_linelength = len(line)
+            longest_line = i + 1
+
+print(f"The longest line is line {longest_line} with a length of {max_linelength}.")

beispiele/readfile4.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+
+import sys
+
+filename = sys.argv[1]
+
+data = {}
+
+with open(filename, "r") as fileobj:
+    for i, line in enumerate(data):
+        line = line.strip()  # remove whitespace from start/end of line
+
+        if line.startswith('#'):
+            # ignore comment lines
+            continue
+
+        name, raw_data = line.split(":", 1)  # split line at first colon
+        items = raw_data.split(",")          # split raw data at commas
+
+        data[name.strip()] = items
+
+
+for key in data:
+    print(key, data[key])