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- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)/04%3A_Functions/4.05%3A_Math_FunctionsPython has a math module that provides most of the familiar mathematical functions. The module object contains the functions and variables defined in the module. To access one of the functions, you ha...Python has a math module that provides most of the familiar mathematical functions. The module object contains the functions and variables defined in the module. To access one of the functions, you have to specify the name of the module and the name of the function, separated by a dot (also known as a period). This format is called dot notation.
- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)/06%3A_Strings/6.05%3A_Strings_are_immutableIt is tempting to use the operator on the left side of an assignment, with the intention of changing a character in a string. The "object" in this case is the string and the "item" is the character yo...It is tempting to use the operator on the left side of an assignment, with the intention of changing a character in a string. The "object" in this case is the string and the "item" is the character you tried to assign. For now, an object is the same thing as a value, but we will refine that definition later. The reason for the error is that strings are immutable, which means you can't change an existing string. The best you can do is create a new string that is a variation on the original:
- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)Writing programs (or programming) is a very creative and rewarding activity. You can write programs for many reasons, ranging from making your living to solving a difficult data analysis problem to ha...Writing programs (or programming) is a very creative and rewarding activity. You can write programs for many reasons, ranging from making your living to solving a difficult data analysis problem to having fun to helping someone else solve a problem. This book assumes that everyone needs to know how to program, and that once you know how to program you will figure out what you want to do with your newfound skills.
- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)/13%3A_Python_and_Web_Services/13.02%3A_Looping_through_NodesOften the XML has multiple nodes and we need to write a loop to process all of the nodes. In the following program, we loop through all of the user nodes:
- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)/14%3A_Object-Oriented_Programming/14.04%3A_Starting_with_ProgramsIt is also important to note that when you looked at that program several chapters back, you could fully understand what was going on in the program without even realizing that the program was "orches...It is also important to note that when you looked at that program several chapters back, you could fully understand what was going on in the program without even realizing that the program was "orchestrating the movement of data between objects". Back then it was just lines of code that got the job done.
- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)/16%3A_Visualizing_data/16.03%3A_Visualizing_mail_dataIn this application, we will perform some of the functions of a search engine. We will first spider a small subset of the web and run a simplified version of the Google page rank algorithm to determin...In this application, we will perform some of the functions of a search engine. We will first spider a small subset of the web and run a simplified version of the Google page rank algorithm to determine which pages are most highly connected, and then visualize the page rank and connectivity of our small corner of the web. We will use the D3 JavaScript visualization library http://d3js.org/ to produce the visualization output.
- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)/07%3A_Files/7.05%3A_Searching_through_a_FileSince find looks for an occurrence of a string within another string and either returns the position of the string or -1 if the string was not found, we can write the following loop to show lines whic...Since find looks for an occurrence of a string within another string and either returns the position of the string or -1 if the string was not found, we can write the following loop to show lines which contain the string "@uct.ac.za" (i.e., they come from the University of Cape Town in South Africa):
- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)/13%3A_Python_and_Web_ServicesThere are two common formats that we use when exchanging data across the web. The "eXtensible Markup Language" or XML has been in use for a very long time and is best suited for exchanging document-st...There are two common formats that we use when exchanging data across the web. The "eXtensible Markup Language" or XML has been in use for a very long time and is best suited for exchanging document-style data. When programs just want to exchange dictionaries, lists, or other internal information with each other, they use JavaScript Object Notation or JSON (see www.json.org). We will look at both formats.
- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)/08%3A_Lists
- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)/11%3A_Regular_Expressions/11.04%3A_Combining_searching_and_extractingIf we want to find numbers on lines that start with the string "X-" such as:
- https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_Languages/Python_for_Everybody_(Severance)/06%3A_Strings/6.12%3A_DebuggingFor example, look at the program which we used to demonstrate the while loop in the chapter on iteration: There are two solutions to this to make line three "safe" even if the line is empty. One possi...For example, look at the program which we used to demonstrate the while loop in the chapter on iteration: There are two solutions to this to make line three "safe" even if the line is empty. One possibility is to simply use the startswith method which returns False if the string is empty. Another way is to safely write the if statement using the guardian pattern and make sure the second logical expression is evaluated only where there is at least one character in the string.:
