added

Mittwoch/User_modify.py

@@ -0,0 +1,75 @@
+#! /usr/bin/env python3
+from pprint import pprint
+
+from argv import argv_value
+
+
+def read_file(path: str) -> "List of lines":
+    #f = open(path, 'r')
+    with open(path, 'r') as f: 
+    # f.read(buflen) - binary read
+    # f.readline() - 1 Textzeile lesen -> str
+    # f.readlines - alle Textzeilen lesen ->str
+    # f ist gleichzeitig Iterator
+    # 1 möglichkeit
+    #lines = list(map(lambda s : s.rstrip(), f))
+    # 2 möflichkeit
+        lines = list(map(str.rstrip, f))
+    # 3 möglichkeit
+    #lines = []
+    #for line in f.readlines():
+    #    lines.append(line.rstrip())
+    #f.close()
+    return lines
+
+def parse_passwd_lines(line: str) -> "Dict of passwd details":
+    parts = line.split(':')
+    userdict = {
+        "username" : parts[0],
+        "uid" : int(parts[2]),
+        "gid" : int(parts[3]),
+        "realname" : parts[4].split(',')[0],
+        "gecos" : parts[4],
+        "home" : parts[5],
+        "shell": parts[6]
+    }
+    return userdict
+
+def build_userlist(lines) -> "List of user dicts":
+    result = []
+    for line in lines:
+        result.append(parse_passwd_lines(line))
+    return result
+
+def print_userlist_sorted_by_username(userlist):
+    #ruft für jedes Element key(elem) also e im Lambda-Ausdruck ist ein Element der Liste user dict
+    for user in sorted(userlist, key=lambda e: e['username'].lower()):
+        #print("{username:{width}} {realname}".format(width=32 **user))
+        print("{:5} {:32} {}".format(
+            user['uid'],
+            user['username'],
+            user['realname'], 
+            user['home'], 
+            user['shell']
+        ))
+            
+def print_userlist_sorted_by_uid(userlist):
+    userlen = max(map(lambda u: len(u['username']), userlist))
+    for user in sorted(userlist, key=lambda e: e['uid']):
+        print("{uid:5} {username:{width}} {realname}".format(width=userlen, **user))
+
+def main():
+    output_functions = {
+        'pprint': pprint,
+        'username': print_userlist_sorted_by_username,
+        'uid': print_userlist_sorted_by_uid,
+        
+    }
+    #outfunc = output_functions['username']
+    outfunc = output_functions[argv_value('-o', default='uid')]
+    lines = read_file("/etc/passwd")
+    userlist = build_userlist(lines)
+    outfunc(userlist)
+
+
+main()