By Joey Bernard

Learn the code to write down algorithms, numerical computations, information research and lots more and plenty extra utilizing the Python language: search for and re-use the recipes to your personal Python coding. This ebook is your convenient code cookbook reference. even if you are a maker, online game developer, cloud computing programmer and extra, it is a must-have reference in your library.

Python Recipes Handbook provides the most typical and modern code snippets, utilizing pandas (Python facts research Library), NumPy, and different numerical Python programs.

What you are going to Learn

  • Code with the pandas (Python information research Library)
  • Work with many of the Python algorithms valuable for modern colossal info analytics and cloud applications
  • Use NumPy and different numerical Python applications and code for doing different types of analysis
  • Discover Python's new renowned modules, applications, extensions and templates library

Who This e-book Is For

This convenient reference is for people with a few event with Python.

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Read or Download Python Recipes Handbook: A Problem-Solution Approach PDF

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Extra resources for Python Recipes Handbook: A Problem-Solution Approach

Sample text

Listing 4-7. read(100) Reading in data line by line is so common that there is a method provided to do just that. In Listing 4-8, you can see how to read in a single line, or how to loop through the entire file. 29 CHAPTER 4 ■ FILES AND I/O Listing 4-8. readline() OR >>> for line in fd1: >>> do_my_process(line) If the file is not too large, you can read the entire contents into a list, where each element is a line from the file. Listing 4-9 provides an example. Listing 4-9. readlines() >>> first_line = file_list[0] Writing a text file only requires a few minor changes.

Listing 2-16. time() 2-8. Calculating Date/Time Differences Problem You need to be able to find differences between two times and/or two dates. 17 CHAPTER 2 ■ NUMBERS, DATES, AND TIMES Solution Python provides the timedelta object as part of the datetime module. How It Works You can create a timedelta object that represents some date or time span. If you have two datetime objects, you can subtract them to get a timedelta object, as in Listing 2-17. Listing 2-17. 532031 If you want to create a fixed timedelta, say one week, that you want to add to a given datetime object, you can create it and use it as in Listing 2-18.

Solution You can apply a translation map to an entire string. This is handy if you want to accomplish several replacements. How It Works You can use the translate() method of your string to apply this mapping. While you could create the translation table manually, the string data type contains a helper function called maketrans() that creates a translation table that maps each character in the first parameter to the character at the same position in the second parameter. This is shown in Listing 1-19.

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