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
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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:
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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
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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: 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.
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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
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.numpy.delete () in Python __delete__: 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.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]
