string-1.py

hello_name
def hello_name(name):
    '''
    Given a string name, e.g. "Bob", return a greeting of the form "Hello Bob!".
    '''
    return 'Hello {}!'.format(name)

# make_abba
def make_abba(a, b):
    '''
    Given two strings, a and b, return the result of putting them together in the order
    abba, e.g. "Hi" and "Bye" returns "HiByeByeHi".
    '''
    return a+b+b+a

# make_tags
def make_tags(tag, word):
    '''
    The web is built with HTML strings like "<i>Yay</i>" which draws Yay as italic text.
    In this example, the "i" tag makes <i> and </i> which surround the word "Yay". Given
    tag and word strings, create the HTML string with tags around the word, e.g. "<i>Yay</i>".
    '''
  return "<{}>{}</{}>".format(tag,word,tag)

# make_out_word
def make_out_word(out, word):
    '''
    Given an "out" string length 4, such as "<<>>", and a word, return a new string where
    the word is in the middle of the out string, e.g. "<<word>>".
    '''
    return "{}{}{}".format(out[:2],word,out[2:])

# extra_end
def extra_end(str):
    '''
    Given a string, return a new string made of 3 copies of the last 2 chars of the original
    string. The string length will be at least 2.
    '''
    return 3*str[-2:]

# first_two
def first_two(str):
    '''
    Given a string, return the string made of its first two chars, so the String "Hello" yields
    "He". If the string is shorter than length 2, return whatever there is, so "X" yields "X",
    and the empty string "" yields the empty string "".
    '''
    if str < 2:
        return str
    return str[:2]

# first_half
def first_half(str):
    '''
    Given a string of even length, return the first half. So the string "WooHoo" yields "Woo".
    '''
    return str[:len(str)/2]

# without_end
def without_end(str):
    '''
    Given a string, return a version without the first and last char, so "Hello" yields "ell".
    The string length will be at least 2.
    '''
    return str[1:-1]

# combo_string
def combo_string(a, b):
    '''
    Given 2 strings, a and b, return a string of the form short+long+short, with the shorter
    string on the outside and the longer string on the inside. The strings will not be the same
    length, but they may be empty (length 0).
    '''
    if len(b) > len(a):
      return a+b+a
    return b+a+b

# non_start
def non_start(a, b):
    '''
    Given 2 strings, return their concatenation, except omit the first char of each. The strings will
    be at least length 1.
    '''
    return a[1:] + b[1:]

# left2
def left2(str):
    '''
    Given a string, return a "rotated left 2" version where the first 2 chars are moved to the end.
    The string length will be at least 2.
    '''
    return str[2:] + str[:2]