From afe3c855070382dbda00583e53b3ec340d91d73e Mon Sep 17 00:00:00 2001
From: Liliana Sanfilippo <liliana.sanfilippo@uni-bielefeld.de>
Date: Wed, 25 Sep 2024 11:18:56 +0200
Subject: [PATCH] code

---
 code/cit.py | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/code/cit.py b/code/cit.py
index c30498d1..afc32716 100644
--- a/code/cit.py
+++ b/code/cit.py
@@ -1,12 +1,30 @@
-import argparse
-import bibtexparser
-import re
+# Voraussetzungen
+#- Python 3.x
+#- bibtexparser (Installieren Sie es mit `pip install bibtexparser`)
 
 
 problemlist = []
 
 def main(): 
+
     print("Starting program...")
+    try:
+        import bibtexparser
+    except ImportError:
+        print("The package 'bibtexparser' is not installed. Install with: pip install bibtexparser")
+        exit(1)
+    try:
+        import argparse
+    except ImportError:
+        print("The package  'argparse' is not installed.")
+        exit(1)
+     try:
+        import re
+    except ImportError:
+        print("The package  're' is not installed.")
+        exit(1)
+
+
     try:
         #reading command line input and parsing it 
         parser = argparse.ArgumentParser(
-- 
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