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python-csi160/week05/week-5Practice-Problems/part1.py

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+def first_element(list_to_search):
+    """Returns the first element of the supplied list.  Returns None if the list was empty"""
+    if len(list_to_search) == 0:
+        return None
+    return list_to_search[0]
+
+
+# Leave this part for easily testing your function
+print('[4, 2, 15, 5] The first_element returns', first_element([4, 2, 15, 5]))
+print('[] The first_element returns', first_element([]))

python-csi160/week05/week-5Practice-Problems/part2.py

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+def second_element(list_to_search):
+    """Returns the second element of the supplied list.  Returns None if list contains less than 2 elements"""
+    if len(list_to_search) < 2:
+        return None
+    return list_to_search[1]
+
+
+# Leave this part for easily testing your function
+print('[4, 2, 15, 5] The second_element returns', second_element([4, 2, 15, 5]))
+print('[3] The second_element returns', second_element([3]))

python-csi160/week05/week-5Practice-Problems/part3.py

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+def last_element(list_to_search):
+    """Returns the last element of the supplied list.
+    Returns None if the list is empty"""
+    if len(list_to_search) == 0:
+        return None
+    return list_to_search[-1]
+
+
+# Leave this part for easily testing your function
+print('[4, 2, 15, 5] The last_element returns', last_element([4, 2, 15, 5]))
+print('[] The last_element returns', last_element([]))

python-csi160/week05/week-5Practice-Problems/part4.py

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+def area_code(phone_number):
+    """ Given a phone number in the format: 802-555-1212
+    extract the first 3 characters and return this as a string
+
+    :param phone_number: (str) Must be formatted "XXX-XXX-XXXX"
+    :return: (str) 3 digit area_code
+    """
+    return phone_number[:3]
+
+
+# Leave this part for easily testing your function
+print('"802-555-1212"  area_code returns', area_code("802-555-1212"))
+print('"410-617-3452"  area_code returns', area_code("410-617-3452"))

python-csi160/week05/week-5Practice-Problems/part5.py

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+def last_four_digits(phone_number):
+    """ Returns the last 4 digits of a phone number as a string
+
+    :param phone_number: (str) May be formatted "XXX-XXX-XXXX" or "1-XXX-XXX-XXXX"
+    :return: (str) last four digits
+    """
+    return phone_number[-4:]
+
+
+# Leave this part for easily testing your function
+print('"802-555-1212"  last_four_digits returns', last_four_digits("802-555-1212"))
+print('"1-410-617-3452"  last_four_digits returns', last_four_digits("410-617-3452"))

python-csi160/week05/week-5Practice-Problems/part6.py

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+def first_last_name(full_name):
+    """ Returns a tuple with the first and last name.
+
+    :param full_name: (str) Contains a first and last name seperated by a space.
+                            There is only a single space in the full_name.
+    :return: (tuple) Tuple containing first and last names
+    """
+    return tuple(full_name.split(" "))
+
+
+# Leave this part for easily testing your function
+print('"Billie Holiday"  first_last_name returns', first_last_name("Billie Holiday"))
+print('"James Brown"  first_last_name returns', first_last_name("James Brown"))

python-csi160/week05/week-5Practice-Problems/part7.py

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+def second_smallest(numbers):
+    """Returns the second smallest number
+
+    :param numbers: (list) List of numbers of at least size 2
+    :return: (int or float) The second smallest number
+    """
+    numbers.sort()
+    return numbers[1]
+
+
+# Leave this part for easily testing your function
+print('[6, 3, 9, 2, 1] second_smallest returns', second_smallest([6, 3, 9, 2, 1]))
+print('[23, 23.25, 23.5, 23] second_smallest returns', second_smallest([23, 23.25, 23.5, 23]))
+
+

python-csi160/week05/week-5Practice-Problems/part8.py

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+def area_code(phone_number):
+    """Returns the area code of the supplied phone number.
+
+    params:
+        phone_number (string) in the format:
+            1-XXX-XXX-XXXX
+            XXX-XXX-XXXX
+            (XXX)-XXX-XXXX
+    return: (string) The area code
+    """
+    if phone_number[0] == '(':
+        return phone_number[1:4]
+    elif phone_number[0] == '1':
+        return phone_number[2:5]
+    else:
+        return phone_number[:3]
+
+
+
+
+# Leave this part for easily testing your function
+print('"1-617-555-1212" area_code returns', area_code("1-617-555-1212"))
+print('"802-999-1212" area_code returns', area_code("802-999-1212"))
+print('"(802)-999-1212" area_code returns', area_code("(802)-999-1212"))