feat: added body of function to avgwordlen

src/textfeatureinfo/textfeatureinfo.py

@@ -1,3 +1,4 @@
+
 # Count number of punctuations
 def count_punc(text):
     """
@@ -48,6 +49,31 @@ def avg_word_len(text):
     >>> avg_word_len("Hello, World!")
     5
     """
+    if not isinstance(text, str):
+        raise TypeError("'text' should be of type 'String'")
+
+    try:
+        from string import punctuation
+    except ImportError:
+        raise ImportError("punctuation from string module failed to import")
+
+    new_text = ""
+    for char in text:
+        if char not in punctuation:
+            new_text = new_text + char
+        else:
+            new_text = new_text + " "
+
+    word_len = [len(word) for word in new_text.split()]
+
+    if len(word_len) == 0:
+        average_len = 0
+    else:
+        average_len = sum(word_len) / len(word_len)
+
+    return average_len
+
+
 
 # Count percentage of fully capitalised words
 def perc_cap_words(text):