1.4 Python File Handling Flashcards
Named locations on disk to store related information
Files
- Text files store the data in the form of characters
- Binary files store the entire data in the form of bytes
Types of Files in Python
We CANNOT use text files to store _________ as they do not contain characters
images
File open modes:
- w
- r
- a
- w+
- r+
- a+
- x
To write data into file. If any data is already present in the file, it would be deleted and the present data will be stored
w
To read data from the file. The file pointer is positioned at the beginning of the file
r
To append data into the file. Appending means adding at the end of the file. If the file does not exist, it will create a new file for writing data
a
To write and read data of a file. The previous data in the file will be deleted
w+
To read and write data into a file. The previous data in the file will not be deleted. The file pointer is placed at the beginning of the file
r+
The append and read data of a file. The file pointed will be at the end of the file if the file exists. If the file does not exist, it creates a new file for reading and writing
a+
To open the file in exclusive creation mode. The file creation fails if the file already exists.
x
f = open(“myfile.txt”, “w”)
where f represents the _________ or file object
file handler
If the file is not closed, the memory utilized by the file is not _______, leading to problems like insufficient memory
freed
Used to store a character or a group of characters (string) into a file
write() or f.write(str)
This will read all the characters from the file ‘f’ and returns them into the string ‘str’
read() or f.read(str)
We can also used read() to read only a specified number of bytes from the file as
f.read(n)
Returns a list of the remaining lines of the entire file
readlines() or f.readline()
To delete a file, you must import the OS module, and run its ______________ function
os.remove()
checks if the file exists
os.path.exists()
The _____________ module represents operating system dependent functionality
os (operating system)
If we want to know the current working directory, we can use _______ method of ‘os’ module
getcwd() or ‘get current working directory’
This method recursively creates the sub directories
mkdir() or ‘make directory’
We can change our current working directory to another existing directory
chidir()
To remove a directory
rmdir()
Recursively removes all the directories
removedirs()
Give a new name to an existing directory
rename()
