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Syntax:bool DirectoryIterator::isWritable (void)Parameters:This function takes no parameters.Return Value:This function returns TRUE if the file / directory is writable, otherwise it returns FALSE.The following programs illustrate the DirectoryIterator::isWritable() function in PHP:Program 1:
// Create an Iterator directory $directory = new DirectoryIterator (dirname ( __ FILE__ ));
// loop is performed for each element foreach ( $directory as $dir ) { // Check for writable element if ( $dir -> isWritable()) { // Show file name echo $dir -> getFilename(). "< br >" ; } }
?> Output:. .. applications.html bitnami.css dashboard favicon.ico engineer.PNG gfg.php img index.php Sublime Text Build 3211 x64 Setup.exe webalizer xampp
Program 2:
// Create the Iterator directory $directory = new DirectoryIterator (dirname ( __ FILE__ ));
// Loop while the catalog item is valid while ( $directory -> valid()) { // Check for writable element if ( $directory -> isWritable() ) { // Show file name echo $directory -> getFilename(). "< br >" ; } // Move to next item $directory -> next(); }
?> Output:. .. applications.html bitnami.css dashboard favicon.ico engineer.PNG gfg.php img index.php Sublime Text Build 3211 x64 Setup.exe webalizer xampp
Note . The output of this function depends on the contents of the server folder.Link: https : //www.php.net/manual/en/directoryiterator.iswritable.php
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PHP DirectoryIterator isWritable () Function dirname: Questions
os.path.dirname(__file__) returns empty
2 answers
I want to get the path of the current directory under which a .py file is executed.
For example a simple file D: est.py with code:
import os
print os.getcwd()
print os.path.basename(__file__)
print os.path.abspath(__file__)
print os.path.dirname(__file__)
It is weird that the output is:
D:
test.py
D: est.py
EMPTY
I am expecting the same results from the getcwd() and path.dirname().
Given os.path.abspath = os.path.dirname + os.path.basename, why
os.path.dirname(__file__)
returns empty?
174
Answer #1
Because os.path.abspath = os.path.dirname + os.path.basename does not hold. we rather have
os.path.dirname(filename) + os.path.basename(filename) == filename
Both dirname() and basename() only split the passed filename into components without taking into account the current directory. If you want to also consider the current directory, you have to do so explicitly.
To get the dirname of the absolute path, use
os.path.dirname(os.path.abspath(__file__))
PHP DirectoryIterator isWritable () Function dirname: Questions
What is the difference between os.path.basename() and os.path.dirname()?
2 answers
What is the difference between os.path.basename() and os.path.dirname()?
I already searched for answers and read some links, but didn"t understand.
Can anyone give a simple explanation?
158
Answer #1
Both functions use the os.path.split(path) function to split the pathname path into a pair; (head, tail).
The os.path.dirname(path) function returns the head of the path.
E.g.: The dirname of "/foo/bar/item" is "/foo/bar".
The os.path.basename(path) function returns the tail of the path.
E.g.: The basename of "/foo/bar/item" returns "item"
From: http://docs.python.org/3/library/os.path.html#os.path.basename
Python"s equivalent of && (logical-and) in an if-statement
5 answers
Here"s my code:
def front_back(a, b):
# +++your code here+++
if len(a) % 2 == 0 && len(b) % 2 == 0:
return a[:(len(a)/2)] + b[:(len(b)/2)] + a[(len(a)/2):] + b[(len(b)/2):]
else:
#todo! Not yet done. :P
return
I"m getting an error in the IF conditional.
What am I doing wrong?
934
Answer #1
You would want and instead of &&.
934
Answer #2
Python uses and and or conditionals.
i.e.
if foo == "abc" and bar == "bac" or zoo == "123":
# do something
How do you get the logical xor of two variables in Python?
5 answers
How do you get the logical xor of two variables in Python?
For example, I have two variables that I expect to be strings. I want to test that only one of them contains a True value (is not None or the empty string):
str1 = raw_input("Enter string one:")
str2 = raw_input("Enter string two:")
if logical_xor(str1, str2):
print "ok"
else:
print "bad"
The ^ operator seems to be bitwise, and not defined on all objects:
>>> 1 ^ 1
0
>>> 2 ^ 1
3
>>> "abc" ^ ""
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for ^: "str" and "str"
794
Answer #1
If you"re already normalizing the inputs to booleans, then != is xor.
bool(a) != bool(b)
We hope this article has helped you to resolve the problem. Apart from PHP DirectoryIterator isWritable () Function, check other dirname-related topics.
Want to excel in Python? See our review of the best Python online courses 2022. If you are interested in Data Science, check also how to learn programming in R.
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Angelo Danburry
Milan | 2022-11-26
Thanks for explaining! I was stuck with PHP DirectoryIterator isWritable () Function for some hours, finally got it done 🤗. Will use it in my bachelor thesis
Carlo Krasiko
Berlin | 2022-11-26
dirname is always a bit confusing 😭 PHP DirectoryIterator isWritable () Function is not the only problem I encountered. Will get back tomorrow with feedback
Javier Nickolson
Tallinn | 2022-11-26
Maybe there are another answers? What PHP DirectoryIterator isWritable () Function exactly means?. I just hope that will not emerge anymore
