Python core programming chapter sixth exercises

6-6 Creating a similar String.strip () function

Method an inefficient method for copying and generating substring objects in large numbers

def Str_strip (s):
While Len (s) >=2:
If s[0]== ':
S=s[1:]
Else
Break
While Len (s) >=2:
If s[-1]== ':
S=S[:-1]
Else
Break
If s== ' or s== ':
Return '
Else
return s

Method Two: Convert to List

def Str_strip (s):

    if s = = "or S = =" ":
        Return ""
    #to List
    Elif Len (s) >=2:
        L = List (s)
        While L and l[0] = = "":
            L.pop (0)
        While L and l[-1] = = "":
            L.pop (-1)
        If L:
            Return "". Join (L)
        Else
            Return ""
    Else
        return s

6-10.
String. Write a function that returns a string similar to the input string, requiring the case of the string to be reversed, for example, enter "Mr.ed" and should return "Mr.ed" as the output.

input = raw_input (' Please input a string: ... ')
Output = '
For I in input:
    if i = = I.upper ():
        Output = output + I.lower ()
    Else
        Output = output + I.upper ()
Print output

Python core programming chapter sixth exercises