import tkinter import os from tkinter import * from tkinter.messagebox import * from tkinter.filedialog import * class Notepad: __ root = Tk () # default window width and height __ thisWidth = 300 __ thisHeight = 300 __ thisTextArea = Text (__root) __ thisMenuBar = Menu (__ root) __ thisFileMenu = Menu (__ thisMenuBar, tearoff = 0 ) __ thisEditMenu = Menu (__ thisMenuBar, tearoff = 0 ) __ thisHelpMenu = Menu (__ thisMenuBar, tearoff = 0 ) # Add scrollbar __ thisScrollBar = Scrollbar (__ thisTextArea) __ file = None def __ init __ ( self , * * kwargs ): # Set icon try : self .__ root .wm_iconbitmap ( "Notepad.ico" ) except : pass # Set window size (default 300x300) try : self .__ thisWidth = kwargs [ ’ width’ ] except KeyError: pass try : self .__ thisHeight = kwargs [ ’height’ ] except KeyError: pass # Set window text self .__ root.title ( "Untitled - Notepad" ) # Center the window screenWidth = self .__ root.winfo_screenwidth () screenHeight = self .__ root .winfo_screenheight () # For the left left = (screenWidth / 2 ) - ( self .__ thisWidth / 2 ) # Right-ally top = (screenHeight / 2 ) - ( self . __thisHeight / 2 ) # For top and bottom self .__ root.geometry ( ’% dx% d +% d +% d’ % ( self .__ thisWidth, self .__ thisHeight, left, top)) # To make the text area automatically resize / code> pass # Set window text self .__ root.title ( "Untitled - Notepad" ) # Center window screenWidth = self .__ root.winfo_screenwidth () screenHeight = self .__ root.winfo_screenheight () # For the left left = (screenWidth / 2 ) Make Notepad using Tkinter __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).
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:
Make Notepad using Tkinter __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
- 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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