Python 第二式

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question

** Simple transposition **

Simple transposition is a basic and simple cryptography technique. We make 2 rows and put first a letter in the Row 1, the second in the Row 2, third in Row 1 and so on until the end. Then we put the text from Row 2 next to the Row 1 text and thats it.

Complete the function that recieves a string and encrypt it with this simple transposition.

Ex:

For example if the text to encrypt is: "Simple text", the 2 rows will be:

Row 1 S m l e t
Row 2 i p e t x

So the result string will be: "Sml etipetx"

solutions

my solutions

def simple_transposition(text):

    l1 = []

    l2 = []

    for i in range(len(text)) :

        if i % 2 == 0:

            l1.append(text[i])

        elif i % 2 != 0:

            l2.append(text[i])

    return "".join(l1)+"".join(l2)

other solutions

def simple_transposition(text):

    return text[::2] + text[1::2]



def simple_transposition(text):

    rowOne = True

    one = ""

    two = ""

    for x in text:

        if(rowOne):

            one += x

        else:

            two += x

        rowOne = not rowOne

    return str(one) + str(two)

还是太菜了
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Python 第二式

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my solutions

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