Python File Write






<!--
main_leaderboard, all: [728,90][970,90][320,50][468,60]
-->



Python File Write



❮ Previous
Next ❯


Write to an Existing File



To write to an existing file, you must add a parameter to the
open() function:


"a" - Append - will append to the end of the file


"w" - Write - will overwrite any existing content




Example


Open the file "demofile.txt" and append content to the file:



f = open("demofile.txt", "a")
f.write("Now the file has one more line!")




Example


Open the file "demofile.txt" and overwrite the content:



f = open("demofile.txt", "w")
f.write("Woops! I have deleted the content!")




Note: the "w" method will overwrite the entire file.





Create a New File



To create a new file in Python, use the open() method,
with one of the following parameters:


"x" - Create - will create a file, returns
an error if the file exist


"a" - Append - will create a file if the
specified file does not exist


"w" - Write - will create a file if the
specified file does not exist



Example


Create a file called "myfile.txt":



f = open("myfile.txt", "x")



Result: a new empty file is created!




Example


Create a new file if it does not exist:



f = open("myfile.txt", "w")






❮ Previous
Next ❯

-

Popular posts from this blog

Python Lists

<!-- main_leaderboard, all: [728,90][970,90][320,50][468,60] --> Python Lists ❮ Previous Next ❯ Python Collections (Arrays) There are four collection data types in the Python programming language: List is a collection which is ordered and changeable. Allows duplicate members. Tuple is a collection which is ordered and unchangeable. Allows duplicate members. Set is a collection which is unordered and unindexed. No duplicate members. Dictionary is a collection which is unordered, changeable and indexed. No duplicate members. When choosing a collection type, it is useful to understand the properties of that type. Choosing the right type for a particular data set could mean retention of meaning, and, it could mean an increase in efficiency or security. List A list is a collection which is ordered and changeable. In Python lists are written with square brackets. Example Create a List: thislist = ["apple", "banana", ...
Read more

Aion

Image
Aion - 6+ , 5417 Aion - . MMORPG, World of Warcraft, World of Tanks My Lineage II . CryEngine. , . : Aion https://ru.4game.com/aion/ Aion , . , , . , , . , , , . . , , , . . : . , . , , . , , . 12 , 2 : ( ). ( ). ( ). ( ) ( ). ( ). , . , : . . , . , , . . , , . Aion, , . , . , . : . . . . , : , , , , , . , , , . : Aion https://ru.4game.com/aion/install/ : . , . , . , Aion . , . . , . , . , , . . : . . . , ( !), MMORPG Aion . , . ...
Read more

JavaScript Array Iteration Methods

<!-- main_leaderboard, all: [728,90][970,90][320,50][468,60] --> JavaScript Array Iteration Methods ❮ Previous Next ❯ Array iteration methods operate on every array item. Array.forEach() The forEach() method Calls a function once for each array element. Example var txt = ""; var numbers = [4, 9, 16, 25]; numbers.forEach(myFunction); function myFunction(value, index, array) {     txt = txt + item + "<br>"; } Try it Yourself » Note that the function takes 3 arguments: The item value The item index The array itself Array.forEach() is not supported in Internet Explorer 8 or earlier: Method forEach() Yes 9.0 Yes Yes Yes Array.map() The map() method creates a new array by performing a function on each array element. This example multiplies each array value by 2: Example var numbers1 = [4, 9, 16, 25]; var numbers2 = numbers1.map(myFunction); function m...
Read more