Most exercises include a link to my solution. I added more exercises, ranging from short tests of understanding to a few substantial projects. General techniques for nding and avoiding bugs, and warnings about Python pit-falls.
Thanks to the members of Monty Python, whose television shows and audio recordings taught me English in a highly enjoyable way. Progress Tracker: a PDF poster that you.on an early version of a Python course, on which I later based this book. International Intellectual Exchange Scholarship for a 4-Year BA ProgramApply your knowledge to solve more than 100 Python exercises and check your solutions with step-by-step video.
Python Exercises Code Created In
SO, instead of using just «any file», we want to create some files, with some specific content. You can use an existing directory, with some existing files, or create a new directory and put some files in it.2) define a variable containing the path to a directory in your computer(hint: the variable is a string, but is a special type of string, isA «raw string», so you need to write a «r» just before it) 3) add «\*» at the end of the directory, to mean «all the files contained4) use the command glob.iglob() in a for loop, to print all the paths ofAll the files contained in the directory Import os library, and use os.path.splitext() and os.path.basename()To list just the names of each file, and not the full path.Exercise: load all files from a directory — part twoIn this second part we use the python code created in the first part, and modify it.Also, now we want to use the files in the directory. Insert the missing indentation to make the code correct: if 5 >Exercise: load all files from a directory — part oneIn this exercise we start creating a directory that contain some files. Python Exercise 1: Syntax, Comments, Variables 1. The material (except where otherwise indicated) is the copyright of the University of Liverpool.View Python Exercises.pdf from IT CABU52XAQM at New Horizons Learning Center.
The task is to find the missing addresses in the second file. The default is tring.strip() which removes all the white space.Exercise: Compare text files with lists of email addressesUsing a text editor, create two text files with email addresses, one address in each line, with no spaces.— Case 1 — there is a longer file, with around 15/20 addresses, and a shorter file with around 10 addresses, chosen out of the list in the first file. Remember to convert from string to int or to floating point, before using in plt.plot().List_of_integers = Also, the command string.strip(«») can remove a character from the end or the beginning of a string. Then, we can create a different label at each step of the for loop, using the «format()» command (something similar to «label_».format(n) ).In this way we can store the data in a dictionary, and use the label as the «key» of the new element of the dictionary.(note: create an empty dictionary before the «for» loop then add a new element to the dictionary, at each step, with the syntax dictionary = data_from_the_file )Exercise: load data from all the text files contained in a directory and plot the dataSimilarly to what done in the previous exercise, let’s use the same idea of a cycle over all the files contained in a directory, and let’s create 2D plots of the data, one plot for each file.We can use the command for path in glob.iglob(r✼:\path\to\the\directory\*.txt»): to create a cycle over all the text files contained in the directory, and at each step of the cycle we open the file, we read data from it, we create a plot, and then we save it.Remenber to import matplotlib (use the command import matplotlib.pyplot as plt) at the beginning of the script.When you read the data, put the data in a variable, and then use that variable for the plt.plot() command.Depending on how you write the data in the files, you can use the command string.split(«\n») or string.split(«, «) (where «string» is the data you read from the file) depending on how you separate the values in the file, with a newline or a comma and a space. One solution is to use the command «n, filepath = enumerate()» in the for loop (enumerate the list of paths generated by glob.iglob). In this case we want to give them the extension «.txt»)2) In each file write a list of several numerical values (around 10 or 15) write one value per line, going to a new line for each value.3) Using the part one of this exercise, and the command open(file_path, «r»), for each step of the «for» loop, open the files in the directory, read the content with the command file.read(), close the file, and write all the numerical values in a list, one list for each file.4) at each step we need to create a different name for the data, and store it in a different place.
The new word has to be a word existing in the language (english, in our case). If you don’t remember the use of those commands, search on the book (Lutz) or on the internet, or, do some test in the console (use a string with several words separated by a space).Create a third file (command output_file_id = open(path_to_new_file, «w»)) to write the resultsThen, to process the lists, use two nested «for loops», one inside the other, the first going through the first list, the second going through the second list.At each step of the internal file use «email1 = email2» to compare the emails Use output_file_id.write(email + «\n») to write the right emails in the output file.An alternative to the use of two loops is this: use only one loop, on the «longer list», and use the structure «if element in short_list:» (or its opposite, «if element not in short_list:», depending on the case).An anagram is a type of word play, the result of rearranging the letters of a word or phrase to produce a new word or phrase, using all the original letters exactly once e.g., orchestra = carthorse. The task is to find the addresses present in both files, and write them in a third file.Open the first file, load all the content in a string variable, close the file.It is useful to use the commands string.split().
use the dictionary at to check if a random combination of letters is an english word or not. use the library «itertools», and use the command itertools.permutations() to find all the permutations of the letter in the initial word (permutation = a re-ordering of the same elements) To avoid problems, use a short word, max 6 letters
0 kommentar(er)
