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Python Reading and Writing Files- Linux Hint

 

Information are used to retailer and set up information on a disk. We regularly use recordsdata when we have to retailer information completely on a tough disk. For instance, say we’re constructing a software program system that maintains pupil information. Now, we have to retailer the scholar information completely for future use. For this objective, we will use recordsdata to retailer information, and afterward, we will open these recordsdata and entry the saved information at any time.

Studying and writing recordsdata are quite common capabilities in Python. It’s straightforward to create, learn, and edit recordsdata in Python. Python comes with built-in capabilities for studying and writing recordsdata. You’ll be able to open, write, and skim recordsdata utilizing the Python built-in capabilities. The file operations are carried out within the following sequence:

  • Open a file
  • Learn/write file
  • Shut file

Utilizing Python, you possibly can create textual content recordsdata and binary recordsdata. Textual content recordsdata retailer information within the type of characters and every line ends in a newline character (‘n’). In binary recordsdata, information is saved within the type of bytes (1 and 0).

On this article, you’ll be taught:

  • A number of the totally different file modes in Python
  • Easy methods to open a file
  • Easy methods to create a file
  • Easy methods to write information to a file
  • Easy methods to learn a file

Totally different File Modes in Python

Modes in Python describe the kind of operation to be carried out on the file. When opening a file, you could specify the mode. Each file has a file deal with. The file deal with acts like a cursor that specifies the place to jot down and skim information. It’s a sort of location pointer. The next embrace among the totally different entry file modes in Python:

Mode Description
r Opens the file in studying mode. This mode is chosen by default if you don’t outline any mode whereas opening the file in Python.
w Writes a file. This mode creates a file if the file doesn’t exist already and overwrites the info within the file.
r+ Used to learn and write the file. It reveals an error if the file doesn’t exist.
a Opens the file in append mode. The file deal with is situated on the finish of the file. This mode doesn’t overwrite the prevailing information however begins writing information on the finish of the file. A brand new file is created if the file doesn’t exist.
a+ Opens the file for studying and writing. This opens the file in append mode for writing. The information is inserted on the finish of the file. A brand new file is created if the file doesn’t exist.
t Opens the file in textual content mode.

Easy methods to Open a File

To open a file in Python, use the built-in open() perform. The open() perform takes two arguments as an enter, i.e., the title of the file and the mode of operation. This perform returns the file object as an output. There isn’t any have to import any module to make use of the open() perform. The next is the syntax of the open() perform:

file_object = open(“file_name”, “mode”)

Right here, ‘file_name’ represents the title of the particular textual content file, whereas ‘mode’ represents the file entry or file operation mode. You can even place r earlier than ‘file_name,’ if the file title consists of particular characters. The r is positioned as follows:

=file_object = open(r“file_name”, “mode”)

For instance, the file title may very well be: “F:newfoldermyfile.txt”

Easy methods to Create a File

The open() perform can be utilized to create recordsdata in Python. Use the append mode (a) contained in the open() perform to create the file. Create a file utilizing the code given under:

file = open(“pattern.txt”,”a”)

Right here, a brand new file object is created. The file object is known as “file.” The title of the newly created textual content file is “pattern.txt.” The textual content file is opened in append mode. It’s going to create the brand new file if the file doesn’t exist already. After creating the file, you could shut the file within the following approach:

The built-in shut() perform is used to shut the file.

Easy methods to Write Information to a File

There are two capabilities in Python used for writing information in a file:

  1. write()
  2. writelines()

The write() perform is used to jot down single line or single string information to a file, whereas the writelines() perform is used to jot down a number of strains of information to a textual content file. Allow us to see some examples of writing information to a file.

Utilizing the write() Operate

On this instance, we’re utilizing the write() perform to jot down information to a file. The file is opened in writing mode. “n” is positioned to specify the tip of the road.

# creating a brand new file object and opening a file in writing mode
file=open(“pattern.txt”,”w”)
#  writing single line to a file

file.write(“Welcome to the linuxhint n”)
#  writing one other single line to a file
file.write(“Welcome again”)

#closing the file
file.shut()

Output

The strains have been written within the textual content recordsdata.

Python Reading and Writing Files- Linux Hint

If we open the file in writing mode and ask the write() perform to jot down extra strains to the file, it’ll overwrite the earlier information and new information will probably be added into the textual content file.

# creating a brand new file object and opening a file in writing mode
file=open(“pattern.txt”,”w”)
#  writing single line to a file

file.write(“Whats up Everybody n”)
#  writing one other single line to a file
file.write(“That is the  changed  string”)

#closing the file
file.shut()

Output

Within the output, it may be seen that the earlier information is changed and new information is added as a substitute within the textual content file.

Python Reading and Writing Files- Linux Hint

If we need to maintain each the earlier and the brand new information within the file, then we will open the file in append mode, like this:

# creating a brand new file object and opening a file in append mode
file=open(“pattern.txt”,”a”)
#  writing single line to a file

file.write(“Whats up Everybody n”)
#  writing one other single line to a file
file.write(“That is the  changed  stringn”)
#  writing one other new single line to a file
file.write(“That is the  newly added string stringn”)
#closing the file
file.shut()

Output

Python Reading and Writing Files- Linux Hint

Utilizing the writelines() Operate

The writelines() perform is used to jot down a number of strains in a textual content without delay, as follows:

# creating a brand new file object and opening a file in writing mode
file=open(“file1.txt”,”w”)
# storing a number of string information in a variable
str = [“Hello everyonen”,”Welcome to the linuxhintn”,”we are using writelines functionn”]
#   utilizing writelines capabilities to jot down information in a file
file.writelines(str)
#closing the file
file.shut()

Output

Python Reading and Writing Files- Linux Hint

Easy methods to Learn a File

To learn a file in Python, first, open the file in studying mode. There are three built-in capabilities in Python for studying a file. These embrace the next:

  1. learn()
  2. readline()
  3. readlines()

learn(): Used to learn the info from a file; returns the entire information within the type of string.

readline(): Reads a line of information from a file; solely returns the primary line.

readlines(): Reads all present strains from a file; returns it within the type of a listing.

The search() perform is used to vary the file deal with place. When studying information within the file, the file deal with positions itself on the finish of the file. Thus, a file deal with is sort of a cursor, with the search() perform because the means to maneuver the cursor.

Allow us to see an instance of studying information from the file.

# opening a file in learn mode
file=open(“file1.txt”,”r”)
# utilizing learn() perform to learn the info from the file
# storing the strains in a variable
information=file.learn()
#  printing the info
print(“That is the output of learn() perform: n”)
print(information)

# utilizing search() perform to deliver the  file place in begin
file.search(0)
# utilizing readline() perform to learn the info from the file
# storing the strains in a variable
information=file.readline()
#  printing the info
print(“That is the output of readline() perform: n”)
print(information)

# utilizing search() perform to deliver the  file place in begin
file.search(0)
# utilizing readlines() perform to learn the info from the file
# storing the strains in a variable
information=file.readlines()
#  printing the info
print(“That is the output of readlines() perform: n”)
print(information)
#closing the file
file.shut()

Output

Python Reading and Writing Files- Linux Hint

Conclusion

It’s usually essential to retailer data or information to a file. In Python, you possibly can simply create, write, and skim recordsdata utilizing the Python built-in capabilities. There isn’t any have to import different modules into your program if you need to learn, write, and create recordsdata. You can even use a number of built-in entry modes whereas utilizing the recordsdata. On this article, we have now defined learn how to learn and write recordsdata in Python with some easy examples.

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