Hacking Secret Ciphers with Python
Chapter 4 – Strings and Writing Programs 41 Python that the character after the slash has a special meaning. Type the following ...
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Hello world But you cannot mix sin ...
Chapter 4 – Strings and Writing Programs 43 spam[2] 'l' Notice that the expression spam[0] evaluates to the string value ' ...
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Negative Indexes Negative indexes ...
Chapter 4 – Strings and Writing Programs 45 'Hello' 'Hello world!'[6:12] 'world!' 'Hello world!'[-6:-1] 'world' 'Hello world! ...
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Slicing is a simple way to g ...
Chapter 4 – Strings and Writing Programs 47 Figure 4 - 2. The file editor window. The cursor is at line 1, column 0. You can alw ...
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Figure 4 - 3. The file editor wind ...
Chapter 4 – Strings and Writing Programs 49 A video tutorial of how to use the file editor is available from this book's website ...
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...this means you are running the ...
Chapter 4 – Strings and Writing Programs 51 Functions........................................................................... ...
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same thing for function calls as “ ...
Chapter 4 – Strings and Writing Programs 53 Summary Writing programs is just about knowing how to speak the computer’s language. ...
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The Reverse Cipher................ ...
Chapter 5 – The Reverse Cipher 55 But the code for the reverse cipher program is easy to explain, so we’ll use it as our first e ...
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Checking Your Source Code with the ...
Chapter 5 – The Reverse Cipher 57 Distribution license can be seen at http://invpy.com/bsd)) I like to have this info in the fil ...
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len('') 0 spam = 'Al' len(spam) ...
Chapter 5 – The Reverse Cipher 59 Figure 5 - 2. The parts of a while loop statement. To understand while loops, we will first ne ...
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Table 5- 1. Comparison operators. ...
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