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CodingBat 　　String-1で私の解答　

hello_name

def hello_name(name):
  return 'Hello ' + name + '!'

make_out_word

def make_out_word(out, word):
  return out[0:2] + word + out[2:4]

first_half

def first_half(str):
  return str[:len(str) / 2]

non_start

def non_start(a, b):
  return a[1:len(a)] + b[1:len(b)]

make_abba

def make_abba(a, b):
  return a + b + b + a

extra_end

def extra_end(str):
  end = str[len(str) - 2] + str[len(str) - 1]
  return end + end + end

without_end

def without_end(str):
  return str[1:len(str) - 1]

left2

def left2(str):
  return str[2:len(str)] + str[0:2]

make_tags

def make_tags(tag, word):
  return '<' + tag + '>' + word + '</' + tag + '>'

first_two

def first_two(str):
  return str[0:2]

combo_string

def combo_string(a, b):
  if len(a) >= len(b):
    return b + a + b
  elif len(b) >= len(a):
    return a + b + a