String-2 directory added

Author: akiltipu

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):
+    cat = 0
+    dog = 0
+    for i in range(0, len(str)-1):
+        if str[i:i+3] == "cat":
+            cat += 1
+        if str[i:i+3] == "dog":
+            dog += 1
+    return cat == 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, 
+# 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(str):
+    alp = "abcdefghijklmnopqersuvwxuz"
+    sum = 0
+    for c in alp:
+        d  = "co" + c + "e"
+    
+        for i in range(len(str)-1):
+            if str[i:i+4] == d:
+                sum += 1
+                
+    return sum

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")
+    sum = 0
+    for i in range(len(str)-1):
+        if str[i:i+2] == 'hi':
+            sum += 1
+    return sum

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):
+    str1 = ""
+    for c in str:
+        str1 += c*2
+    return str1

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):
+    a = a.lower()
+    b = b.lower()
+    a1 = len(a)
+    b1 = len(b)
+    
+    if a1 == b1 and a == b:
+        return True
+    elif a1 > b1:
+        return a.endswith(b)
+    else:
+        return b.endswith(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.startswith('xyz'):
+        return True
+    
+    for i in range (len(str)):
+        if str[i-1] != '.' and str[i:i+3] == 'xyz':
+        return True
+    return False