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[babynames_answers] / challenge_4.py

diff --git a/challenge_4.py b/challenge_4.py
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+# 4. How many boys and girls are described in the dataset (i.e., how many boys
+#    and girls born in 2013 have names given to at least four others)?
+
+import ssadata
+
+numberOfBoys = 0
+for boysName in ssadata.boys.keys():
+        numberOfBoys = numberOfBoys + ssadata.boys[boysName]
+
+numberOfGirls = 0
+for girlsName in ssadata.girls.keys():
+        numberOfGirls = numberOfGirls + ssadata.girls[girlsName]
+
+print("There are " + str(numberOfBoys) + " boys and " + str(numberOfGirls) + " girls in the data set.")
+