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String-2/cat_dog.py

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+#CodingBat - Python
+
+#cat_dog
+
+#Return True if the string "cat" and "dog" appear the same number of times in
+#the given string.
+
+# cat_dog('catdog') → True
+# cat_dog('catcat') → False
+# cat_dog('1cat1cadodog') → True
+
+def cat_dog(str):
+    count1, count2 = 0, 0
+
+    for e in range(len(str)):
+        if str[e:e+3] == "cat":
+            count1 += 1
+        elif str[e:e+3] == "dog":
+            count2 += 1
+
+    if count1 == count2:
+        return True
+    return False
+
+
+print(cat_dog('catdog'))
+print(cat_dog('catcat'))
+print(cat_dog('1cat1cadodog'))