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String-2/count_hi.py

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+#CodingBat - Python
+
+#count_hi
+
+#Return the number of times that the string "hi" appears anywhere in the given
+#string.
+
+# count_hi('abc hi ho') → 1
+# count_hi('ABChi hi') → 2
+# count_hi('hihi') → 2
+
+def count_hi(str):
+  count = 0
+  for e in range(len(str)-1):
+    next_two = str[e:e+2]
+    if next_two == "hi":
+      count += 1
+  return count
+
+
+print(count_hi('abc hi ho'))
+print(count_hi('ABChi hi'))
+print(count_hi('hihi'))

String-2/double_char.py

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+#CodingBat - Python
+
+#double_char
+
+#Given a string, return a string where for every char in the original, there
+#are two chars.
+
+# double_char('The') → 'TThhee'
+# double_char('AAbb') → 'AAAAbbbb'
+# double_char('Hi-There') → 'HHii--TThheerree'
+
+def double_char(str):
+
+  result = ""
+  for i in range(len(str)):
+    result += str[i] + str[i]
+
+  return result
+
+
+print(double_char('The'))
+print(double_char('AAbb'))
+print(double_char('Hi-There'))
+# =============================================================================
+
+# def double_char(str):
+#   str2 = ""
+#   for i in str:
+#     str2 = str2 + i + i
+#   return str2
+
+
+# def double_char(str):
+#   str2 = ""
+#   for e in str:
+#     str2 += (e * 2)
+#   return str2