Remove String From Javascript String

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You can remove a character from a Python string using replace () or translate (). Both of these methods replace a character or string with a certain value. If an empty string is specified, the selected character or string is removed from the string without any replacement.

Not all strings contain the values ‚Äã‚Äãwe want them to contain. A user can insert a symbol in an input field that he does not want to display. You may want to remove any instance of a particular letter from a string.

It doesn’t matter which character you want to remove from a string. Python has what you need !

In this guide, we’ll explain how to remove a character or a set of characters from a string. We’ll refer to a few examples along the way.

We will discuss the following approaches:

  • Using the replace () method
  • Using the transform () method
  • Remove the last character by using the indexing

the get Let’s start

Delete character string Python replace ()

the function string replace () replaces a character with a new character. This function can be used to replace any character with an empty string.

We are building a program that asks a user to enter a username. Underscores (_) are not allowed in a username. Open a new Python file and paste the following code:

This code asks the user to choose a username using the () input method .

replace () method removes the underscore from the original string and replaces all instances of that character with an empty string. Then we print the username without underscores on the console

We manage our program.

Our code removed the underscore from the username we specified. Our code works on strings that do not contain an underscore:

When a username does not include an underscore, nothing happens

Remove multiple characters using replace ()

What if you want to remove multiple characters from a string ? Python can help. We can use the replace () method in a loop to remove multiple characters from a string. <

p> In our last example, we removed an underscore from a username. What if we wanted to remove all periods (periods), underscores, and exclamation points from our string ? Create a new Python file and paste this code:

First of all, we asked a user to choose a name of user and we have defined a string that contains all the characters that have to do not appear in a user’s username.

Next, we created a for loop. This for loop iterates through each character in the "disallowed_characters" string. In each iteration, the character After the loop is iterate will be replaced in the " username" string with an empty character

Let run our code:.

Our code filtered out dots and exclamation points.

Remove character from Python string: translate ()

The Python The translate () method replaces the characters of a string according to the contents of a character table. This method takes one argument: the translation table with the characters to be mapped.

To use this method , we need to create a translation table . This table indicates which characters should be replaced in a string

We use translate () method to remove all underscores from a name of user:

This code replaces each instance of "_" character with a value of None . Python ord () method returns the Unicode code associated with the "_" character. This is used by the translate () method to identify the character we want to remove.

Remove multiple characters using translate ()

You can remove multiple characters from a string using translate ().

We can do this by creating an iterator that iterates through a list of characters we want to remove from a string.

We remove all underscores, periods, and exclamation points a username:

translate () < / em> checks if each character in the string " username " equals a period, exclamation point, or underscore. If any of these characters are found, it is replaced by None. This removes the character from the string.

We use a Python List Understanding to iterate through each character in our excluded list. characters

we will try our program:

Our code successfully removed any special characters we specified from our string.

Python: remove last character from string

To remove the last character from a string, use the slice [: -1] notation. This notation selects the character at index position -1 (the last character in a list). So the syntax returns all characters except this one.

The syntax for removing the last character from a string is:

Remove example from last character

We want to build a program that removes the last character from an employee identifier. This character tells us which department an employee works.

For example, the value "M" tells us that the employee works for the marketing department. We are about to delete this character. This employee monitoring system is being replaced by a new system. The new system keeps track of which department an employee works for

Let’s start by asking the user to enter an employee ID using the input () method :

Then remove the last character of the identifier:

the [: -1] is a slice of operation string which removes the last character from the list We use negative indexing to retrieve the elements end. Now display the new employee ID in the console:

Our program removes the last value in an employee ID .

Conclusion

You can remove one character or multiple characters from a string using replace () or translate () . Both the replace () and translate () methods return the same result:. A string without the characters you specified

To begin with, replace () is easier to use. This is because it only accepts two parameters.

The first parameter is the character you want to replace. Our second parameter is the value you want to replace the character with. If you want to replace other characters, you can use a for loop.

Want to learn more about Python ? Check out our Complete Python Learning Guide for expert advice that will help you advance your learning journey.

Remove String From Javascript String __del__: Questions

How can I make a time delay in Python?

5 answers

I would like to know how to put a time delay in a Python script.

2973

Answer #1

import time
time.sleep(5)   # Delays for 5 seconds. You can also use a float value.

Here is another example where something is run approximately once a minute:

import time
while True:
    print("This prints once a minute.")
    time.sleep(60) # Delay for 1 minute (60 seconds).

2973

Answer #2

You can use the sleep() function in the time module. It can take a float argument for sub-second resolution.

from time import sleep
sleep(0.1) # Time in seconds

How to delete a file or folder in Python?

5 answers

How do I delete a file or folder in Python?

2639

Answer #1


Path objects from the Python 3.4+ pathlib module also expose these instance methods:

Remove String From Javascript String __delete__: Questions

2639

Answer #2


Path objects from the Python 3.4+ pathlib module also expose these instance methods:

2639

Answer #3

Python syntax to delete a file

import os
os.remove("/tmp/<file_name>.txt")

Or

import os
os.unlink("/tmp/<file_name>.txt")

Or

pathlib Library for Python version >= 3.4

file_to_rem = pathlib.Path("/tmp/<file_name>.txt")
file_to_rem.unlink()

Path.unlink(missing_ok=False)

Unlink method used to remove the file or the symbolik link.

If missing_ok is false (the default), FileNotFoundError is raised if the path does not exist.
If missing_ok is true, FileNotFoundError exceptions will be ignored (same behavior as the POSIX rm -f command).
Changed in version 3.8: The missing_ok parameter was added.

Best practice

  1. First, check whether the file or folder exists or not then only delete that file. This can be achieved in two ways :
    a. os.path.isfile("/path/to/file")
    b. Use exception handling.

EXAMPLE for os.path.isfile

#!/usr/bin/python
import os
myfile="/tmp/foo.txt"

## If file exists, delete it ##
if os.path.isfile(myfile):
    os.remove(myfile)
else:    ## Show an error ##
    print("Error: %s file not found" % myfile)

Exception Handling

#!/usr/bin/python
import os

## Get input ##
myfile= raw_input("Enter file name to delete: ")

## Try to delete the file ##
try:
    os.remove(myfile)
except OSError as e:  ## if failed, report it back to the user ##
    print ("Error: %s - %s." % (e.filename, e.strerror))

RESPECTIVE OUTPUT

Enter file name to delete : demo.txt
Error: demo.txt - No such file or directory.

Enter file name to delete : rrr.txt
Error: rrr.txt - Operation not permitted.

Enter file name to delete : foo.txt

Python syntax to delete a folder

shutil.rmtree()

Example for shutil.rmtree()

#!/usr/bin/python
import os
import sys
import shutil

# Get directory name
mydir= raw_input("Enter directory name: ")

## Try to remove tree; if failed show an error using try...except on screen
try:
    shutil.rmtree(mydir)
except OSError as e:
    print ("Error: %s - %s." % (e.filename, e.strerror))

Is there a simple way to delete a list element by value?

5 answers

I want to remove a value from a list if it exists in the list (which it may not).

a = [1, 2, 3, 4]
b = a.index(6)

del a[b]
print(a)

The above case (in which it does not exist) shows the following error:

Traceback (most recent call last):
  File "D:zjm_codea.py", line 6, in <module>
    b = a.index(6)
ValueError: list.index(x): x not in list

So I have to do this:

a = [1, 2, 3, 4]

try:
    b = a.index(6)
    del a[b]
except:
    pass

print(a)

But is there not a simpler way to do this?

1055

Answer #1

To remove an element"s first occurrence in a list, simply use list.remove:

>>> a = ["a", "b", "c", "d"]
>>> a.remove("b")
>>> print(a)
["a", "c", "d"]

Mind that it does not remove all occurrences of your element. Use a list comprehension for that.

>>> a = [10, 20, 30, 40, 20, 30, 40, 20, 70, 20]
>>> a = [x for x in a if x != 20]
>>> print(a)
[10, 30, 40, 30, 40, 70]

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