By Joey Bernard
Python Recipes is your convenient code cookbook reference from Apress. Written by way of Robert A. Gibson of IBM, this advisor supplies the most typical and modern code snippets for todays probably and critical sorts of purposes concerning the Python language. during this reference, youll research the code to put in writing algorithms, numerical computations, info research and lots more and plenty extra: search for and re-use the recipes on your personal Python coding. no matter if youre a maker, video game developer, cloud computing programmer and extra, this can be a must-have reference to your library.
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The usual way to iterate over the contents is within a for loop, as in Listing 3-10. Listing 3-10. csv') >>> for line in file1: . . : print(line) . : 1,one 2,two 3,three 4,four The returned file object is actually an iterable function, however, so you can use it like any other iterator. Listing 3-11 shows an example. Listing 3-11. csv') >>> next(file1) '1,one\n' >>> next(file1) '2,two\n' 24 CHAPTER 3 ■ ITERATORS AND GENERATORS 3-5. Iterating Over Data That Has no Iterator Problem You need to create an iterable version of data that is not already iterable.
This is the same as g except it uses the current locale to get the correct separator characters. (continue) 14 CHAPTER 2 ■ NUMBERS, DATES, AND TIMES Type Meaning % Percentage, where the number is multiplied by 100, displayed in f format with a percentage sign. None This is the same as g. Examples are shown in Listing 2-9. Listing 2-9. 000000%' 2-5. Working with Arbitrary Precision Numbers Problem You need to work with floating point numbers that are of arbitrary size and precision. Solution Python provides a module called decimal that handles numbers of user-defined precision.
For example, if you are entering hexadecimal numbers, you use the code in Listing 1-14. 7 CHAPTER 1 ■ STRINGS AND TEXTS Listing 1-14. Type Cast Functions >>> hex1 = int("ae", 16) >>> hex1 174 The possible bases are 2 to 36. 1-10. Iterating Over the Characters of a String Problem You need to iterate over the characters of a string object and apply some process for each character. Solution You can iterate over each character by using a for loop. How It Works If you need to process each of the individual characters of a given string, then you need to be able to iterate over that string.