String-2 Solutions

Author: rokas2019

String-2/cat_dog.py

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+# Return True if the string "cat" and "dog" appear the same number of times in the given string.
+#
+#
+# cat_dog('catdog') → True
+# cat_dog('catcat') → False
+# cat_dog('1cat1cadodog') → True
+
+def cat_dog(str):
+    return str.count("cat") == str.count("dog")

String-2/count_code.py

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+# Return the number of times that the string "code" appears anywhere in the given string, except we'll accept any
+# letter for the 'd', so "cope" and "cooe" count.
+#
+#
+# count_code('aaacodebbb') → 1
+# count_code('codexxcode') → 2
+# count_code('cozexxcope') → 2
+
+def count_code(stri):
+    return sum(1 for i in range(len(stri) - 3)
+               if stri[i:i+2] == "co" and stri[i+3] == "e")
+
+
+print(count_code('codexxcode'))

String-2/count_hi.py

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+# 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):
+    return str.count("hi")
+
+
+

String-2/double_char.py

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+# 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):
+    return "".join([x * 2 for x in str])
+
+
+print(double_char("The"))

String-2/end_other.py

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+# Given two strings, return True if either of the strings appears at the very end of the other string,
+# ignoring upper/lower case differences (in other words, the computation should not be "case sensitive"). Note:
+# s.lower() returns the lowercase version of a string.
+#
+#
+# end_other('Hiabc', 'abc') → True
+# end_other('AbC', 'HiaBc') → True
+# end_other('abc', 'abXabc') → True
+
+def end_other(a, b):
+    low_a = a.lower()
+    low_b = b.lower()
+    return low_a.endswith(low_b) or low_b.endswith(low_a)

String-2/xyz_there.py

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+# Return True if the given string contains an appearance of "xyz" where the xyz is not directly preceeded by a period
+# (.). So "xxyz" counts but "x.xyz" does not.
+#
+#
+# xyz_there('abcxyz') → True
+# xyz_there('abc.xyz') → False
+# xyz_there('xyz.abc') → True
+
+def xyz_there(str):
+    if str[:3] == "xyz":
+        return True
+    for i in range(len(str) - 2):
+        if str[i - 1] != "." and str[i:i + 3] == "xyz":
+            return True
+    return False