👻 Check our latest review to choose the best laptop for Machine Learning engineers and Deep learning tasks!
About:
numpy.delete (array, object, axis = None): returns a new array with subarrays deleted along with the mentioned axis.
Parameters :
array: [array_like] Input array. object: [int, array of ints] Sub-array to delete axis: Axis along which we want to delete sub-arrays. By default, it object is applied to applied to flattened array
Return:
An array with sub-array being deleted as per the mentioned object along a given axis.
Code 1: removing from 1D array
|
Output:
arr: [0 1 2 3 4 ] Repeating arr 2 times: [0 0 1 1 2 2 3 3 4 4] Shape: (10,) Repeating arr 3 times: [0 0 0 ..., 4 4 4] Shape: (15,)
Code 2:
|
Output:
arr: [[0 1 2 3] [4 5 6 7] [8 9 10 11]] Shape: (3, 4) deleteing arr 2 times: [[0 1 2 3] [8 9 10 11] ] Shape: (2, 4) deleteing arr 2 times: [[0 2 3] [4 6 7] [8 10 11]] Shape: (3, 3) deleteing arr 3 times: [0 3 4 5 6 7 8 9 10 11] Shape: (3, 3)
Code 3: deletion is performed using boolean m asks
|
Output:
Original array : [0 1 2 3 4] Mask set as: [False True False True True] Deletion Using a Boolean Mask: [1 3 4]
https://docs.scipy.org/ doc / numpy / reference / generated / numpy.delete.html
Notes:
👻 Read also: what is the best laptop for engineering students?
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. Answer #1 Here is another example where something is run approximately once a minute: Answer #2 You can use the How to delete a file or folder in Python? 5 answers How do I delete a file or folder in Python? Answer #1 Answer #2 Answer #3 Or Or pathlib Library for Python version >= 3.4 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. EXAMPLE for Example for 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). The above case (in which it does not exist) shows the following error: So I have to do this: But is there not a simpler way to do this? Answer #1 To remove an element"s first occurrence in a list, simply use Mind that it does not remove all occurrences of your element. Use a list comprehension for that. We hope this article has helped you to resolve the problem. Apart from numpy.delete () in Python, check other __del__-related topics. Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R. By the way, this material is also available in other languages: Munchen | 2023-02-01 I was preparing for my coding interview, thanks for clarifying this - numpy.delete () in Python in Python is not the simplest one. Will get back tomorrow with feedback London | 2023-02-01 I was preparing for my coding interview, thanks for clarifying this - numpy.delete () in Python in Python is not the simplest one. I am just not quite sure it is the best method Warsaw | 2023-02-01 I was preparing for my coding interview, thanks for clarifying this - numpy.delete () in Python in Python is not the simplest one. Checked yesterday, it works!
These codes will not work for online IDs. Please run them on your systems to see how they work
This article is provided by Mohit Gupta_OMG
numpy.delete () in Python __del__: Questions
import time
time.sleep(5) # Delays for 5 seconds. You can also use a float value.
import time
while True:
print("This prints once a minute.")
time.sleep(60) # Delay for 1 minute (60 seconds).
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
numpy.delete () in Python __del__: Questions
os.remove()
removes a file.os.rmdir()
removes an empty directory.shutil.rmtree()
deletes a directory and all its contents.
Path
objects from the Python 3.4+ pathlib
module also expose these instance methods:
pathlib.Path.unlink()
removes a file or symbolic link.pathlib.Path.rmdir()
removes an empty directory.
os.remove()
removes a file.os.rmdir()
removes an empty directory.shutil.rmtree()
deletes a directory and all its contents.
Path
objects from the Python 3.4+ pathlib
module also expose these instance methods:
pathlib.Path.unlink()
removes a file or symbolic link.pathlib.Path.rmdir()
removes an empty directory.Python syntax to delete a file
import os
os.remove("/tmp/<file_name>.txt")
import os
os.unlink("/tmp/<file_name>.txt")
file_to_rem = pathlib.Path("/tmp/<file_name>.txt")
file_to_rem.unlink()
Path.unlink(missing_ok=False)
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
a. os.path.isfile("/path/to/file")
b. Use exception handling.
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()
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))
a = [1, 2, 3, 4]
b = a.index(6)
del a[b]
print(a)
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
a = [1, 2, 3, 4]
try:
b = a.index(6)
del a[b]
except:
pass
print(a)
list.remove
:>>> a = ["a", "b", "c", "d"]
>>> a.remove("b")
>>> print(a)
["a", "c", "d"]
>>> 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]