Challenge 3 Solved

Author: Leomelati

Challenges/Challenge_3.py

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+# We can found it at the source code
+
+import requests
+
+# Get the Source Code
+http = requests.get("http://www.pythonchallenge.com/pc/def/equality.html")
+
+# Remove the line breaks of the text in the source code
+source_code = http.text.replace("\n","")
+
+# Separete the text by the comment mark
+textos = source_code.split("<!--")
+
+#Create a list that I will use to storage the letters
+letters = []
+
+# "posição" will be used to track the letter index
+posição = 0
+for letter in textos[1]:
+    if letter.islower():
+        # Get the four letter before and after
+        seleção = textos[1][max(posição - 4,0): posição + 5]
+        primeira = seleção[0]
+        ultima = seleção[-1]
+        # Check if the first and the last one letter in the selection is lowercase
+        if primeira.islower() and ultima.islower():
+                tres_primeiras = seleção[1:4]
+                tres_ultimas = seleção[5:-1]
+                #Check if the three letters before and after are uppercase
+                if tres_primeiras.isupper() and tres_ultimas.isupper():
+                        letters.append(letter)
+
+    posição += 1    
+
+# Join the letters of the list
+print("".join(letters))
+
+# http://www.pythonchallenge.com/pc/def/linkedlist.php is the answer