Complete pangram.py

pangram/pangram.py

@@ -1,2 +1,24 @@
 def is_pangram(sentence):
-    pass
+    """
+    To see if all 26 alphabets are being used
+    """
+
+    # to lower
+    sentence = sentence.lower()
+
+    # create a hashmap to store the frequency of each ascii letter
+    # frequency = dict()
+    frequency = [0]*26
+    # a: 97; z:122
+    for char in sentence:
+        if ord(char)<97 or ord(char)>122:
+            pass
+        else:
+            frequency[ord(char) - 97] += 1
+
+    for i in frequency:
+        if i == 0:
+            return False
+
+    return True
+