Add solutions for uebungen for files

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

beispiele/http1.py

@@ -0,0 +1,34 @@
+import sys
+import requests
+import lxml.html
+
+base_url = "https://en.wikipedia.org/"
+if len(sys.argv) >= 2:
+    url = base_url + sys.argv[1]
+else:
+    url = "https://en.wikipedia.org/wiki/Python_(programming_language)"
+
+resp = requests.get(url)
+
+see_also = []
+
+if resp.status_code == 200:
+    html = resp.text
+    #print(html[:100])
+    tree = lxml.html.fromstring(html)
+
+    see_also_heading = tree.xpath("//span[@id='See_also']")[0].getparent()
+
+    for sibling in see_also_heading.itersiblings():
+        hrefs = sibling.xpath("li/a")
+
+        for href in hrefs:
+            title = href.get("title")
+            see_also_url = href.get("href")
+            #print(title, see_also_url)
+            ## TODO
+            ## Parse URL from command line with urlllib.parse.urlsplit()
+            ## and concatenate base URL and relative URL from link
+            see_also.append((title, base_url + see_also_url))
+
+print(see_also)

beispiele/readfile6.py

@@ -24,11 +24,13 @@ try:
                 print(f"Warning: could not parse line {i+1}: {exc}")
             else:
                 try:
-                    items = [int(item) for item in raw_data.split(",")]          # split raw data at commas
+                    # split raw data at commas
+                    items = [int(item.strip()) for item in raw_data.split(",")]
                 except (ValueError, TypeError) as exc:
                     print(f"Warning: could not parse data on line {i+1}: {exc}")
+                else:
+                    data[name.strip()] = items
 
-            data[name.strip()] = items
 except OSError as exc:
     print(f"Could not open file {filename}: {exc}")
 

loesungen/dateien.py

@@ -0,0 +1,137 @@
+# Aufgabe 1
+
+fp = open("../uebungen/employee_skills.txt", encoding="utf-8")
+contents = fp.read()
+fp.close()
+
+print("Länge:", len(contents))
+
+print("-" * 50)
+
+# Alternativ:
+
+with open("../uebungen/employee_skills.txt") as fp:
+    contents = fp.read()
+
+print(contents)
+
+print("-" * 50)
+
+
+# Aufgabe 2
+
+with open("../uebungen/employee_skills.txt") as fp:
+    i = 0
+    for line in fp:
+        line = line.strip()
+
+        if not line:
+            continue
+
+        i += 1
+
+print("Nicht leere Zeilen:", i)
+
+print("-" * 50)
+
+
+# Aufgabe 3
+
+employees = []
+with open("../uebungen/employee_skills.txt") as fp:
+    for line in fp:
+        if not line.strip():
+            continue
+
+        name = line.split(":")[0].strip()
+        employees.append(name)
+
+employees.sort()
+
+for name in employees:
+    print(name)
+
+print("-" * 50)
+
+
+# Aufgabe 4
+
+employee_salaries = {}
+with open("../uebungen/salaries.txt") as fp:
+    for line in fp:
+        if not line.strip():
+            continue
+
+        name, salary = line.strip().split(":", 1)
+        name = name.strip()
+        salary = int(salary.strip())
+        employee_salaries[name] = salary
+
+print("Min. Gehalt:", min(employee_salaries.values()))
+print("Max. Gehalt:", max(employee_salaries.values()))
+
+print("-" * 50)
+
+
+# Aufgabe 5
+
+employee_skills = {}
+with open("../uebungen/employee_skills.txt") as fp:
+    for line in fp:
+        if not line.strip():
+            continue
+
+        name, skills = line.strip().split(":", 1)
+        name = name.strip()
+        skills = [item.strip() for item in skills.split(",")]
+        employee_skills[name] = skills
+
+
+# Aufgabe 6
+
+employees = {}
+
+for key in employee_salaries:
+    salary = employee_salaries.get(key, 0)
+    skills = employee_skills.get(key)
+    employees[key] = {"skills": skills, "salary": salary}
+
+print("-" * 50)
+
+
+# Aufgabe 6
+
+employee_salaries = {}
+try:
+    with open("../uebungen/salaries-errors.txt") as fp:
+        for i, line in enumerate(fp):
+            # remove whitspace at satrt / end of line
+            line = line.strip()
+
+            # ignore empty / whitespace-only lines
+            # and comment lines
+            if not line or line.startswith("#"):
+                continue
+
+            try:
+                name, salary = line.strip().split(":", 1)
+            except ValueError as exc:
+                print(f"Warning: could not parse line {i+1}: {exc}")
+            else:
+                name = name.strip()
+                try:
+                    salary = salary.strip()
+                    salary = salary.strip("$€")
+                    salary = int(salary)
+                except (ValueError, TypeError) as exc:
+                    print(f"Warning: could not parse data on line {i+1}: {exc}")
+                else:
+                    employee_salaries[name] = salary
+except FileNotFoundError as exc:
+    print(f"Could not open file: {exc}")
+
+
+print("Min. Gehalt:", min(employee_salaries.values()))
+print("Max. Gehalt:", max(employee_salaries.values()))
+
+print("-" * 50)