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+#! /usr/bin/env python3
+
+# Practice Chap. 7
+# Password Strength Tester
+
+import re
+
+def passStrengthTest(passWord):
+    lowerRegex = re.compile(r'[a-z]')
+    upperRegex = re.compile(r'[A-Z]')
+    numRegex = re.compile(r'[0-9]')
+    molower = lowerRegex.search(passWord)
+    moupper = upperRegex.search(passWord)
+    monum = numRegex.search(passWord)
+    if len(passWord) < 8:
+        print('Your password is less than 8 characters which is too short.')
+    elif not molower:
+        print('You need at least one lower case letter.')
+    elif not moupper:
+        print('You need at least one upper case letter.')
+    elif not monum:
+        print('You need at least one number.')
+    else:
+        print('Your password is strong!')
+
+
+print('What is your password?')
+passW = input()
+passStrengthTest(passW)
+