Python String decode() Method

Introduction:

In this tutorial we are learning about the Python String decode() method. Python's string decode() method decodes a string using a registered codec for its encoding. This function can be used to decode the encoded string and obtain the original string. This function works based on the encoding and error. There are many standard encodings like Base64, ascii, utf_32, utf_16 etc. Determines the string based on the specified encoding. You can use the different error-handling schemes to configure different solutions during this process. Finally, the method returns the decoded string.

Syntax:

The syntax of the Strings decode() method in Python is given below-

Parameters:

The parameters of the Strings decode() method in Python are given below -

encoding: It is specifying the encoding in which the decoding should be made.
error: It is used to decide how you will deal with errors that arise, such as "strict" to fix Unicode errors when exceptions occur and "ignore" to ignore errors that occur.

Return value:

The decode() method returns the original given string from the encoded string.

String encoded and decoded in Python:

The Python's string decode() method uses "utf_16" as the encoding to obtain a variable length. If the error is specified as "strict", then the error raises a UnicodeError. In the example below, the string "Hello everyone, Welcome to javatpoint". Create and encode using the Encode() function. Now, the encoded string is returned, and the decode() function is called on the string. The decoded string is output and printed using the print() function. In both cases, the encoding used is "utf_16" and the error used is "strict".

Program code:

Here we give a program code of the string encoded and decoded in Python. The code is given below -

# Here, we initialize the string
string = "Hello everyone, Welcome to javatpoint"

# Here, we find the encoded string and print it
encode_string = string.encode('utf_16','strict')
print("The encoded string from the given string is: ", encode_string)

# Here we find decoded string and print it
decode_string = encode_string.decode('utf_16', 'strict')
print("The decoded string from the given string is: ", decode_string)

Output:

Now, we run the above code and find the encoded and decoded string in Python. The output is given below -

The encoded string from the given string is:  b'\xff\xfeH\x00e\x00l\x00l\x00o\x00 \x00e\x00v\x00e\x00r\x00y\x00o\x00n\x00e\x00,\x00 \x00W\x00e\x00l\x00c\x00o\x00m\x00e\x00 \x00t\x00o\x00 \x00j\x00a\x00v\x00a\x00t\x00p\x00o\x00i\x00n\x00t\x00'
The decoded string from the given string is:  Hello everyone, Welcome to javatpoint

Program code:

Here, we give another program code of the string encoded and decoded in Python. The code is given below -

# Here, we initialize the string
Str = "Welcome to javatpoint"

# Here, we find the encoded string and print it
encode_str = Str.encode('utf-8') 
print('String encoded in base64 format:') 
print(encode_str) 
  
# Here, we find a decoded string and print it
decode_str = encode_str.decode('utf-8') 
print('Here the decoded string is:') 
print(decode_str)

Output:

Now, we run the above code and find the encoded and decoded string in Python. The output is given below -

String encoded in base64 format:
b'Welcome to javatpoint'
Here the decoded string is:
Welcome to javatpoint

Program code:

The Python's string decode() method uses "euc_kr" as the encoding to distinguish the lengths of the characters. When we specified the error as "strict", then the error raises a UnicodeError. In the example below, the string "Hello everyone, Welcome to javatpoint". Create and encode using the encode() function. Now, take the encoded string, call the decode() function of the string, and use the print() function to output and print the decoded string. In both cases, the encoding used is "euc_kr" and the error used is "strict". Here we give a program code of the string encoded and decoded in Python. The code is given below -

# Here, we initialize the string
string = "Hello everyone, Welcome to javatpoint"

# Here, we find the encoded string and print it
encode_string = string.encode('euc_kr','strict')
print("Here the encoded string is: ", encode_string)

# Here we find decoded string and print it
decode_string = encode_string.decode('euc_kr', 'strict')
print("Here the decoded string is: ", decode_string)

Output:

Now, we run the above code and find the encoded and decoded string in Python. The output is given below -

Here the encoded string is:  b'Hello everyone, Welcome to javatpoint'
Here the decoded string is:  Hello everyone, Welcome to javatpoint

Program code:

The Python's string decode() method uses "utf_32" as the encoding to obtain the length of the variable. If the error is specified as "replace", it is replaced with the replacement marker. This is used in the replace_errors() function. In the example below, the string is "Hello everyone, Welcome to javatpoint". Create and encode using the Encode() function. Now, take the encoded string, call the decode() function of the string, and use the print() function to output and print the decoded string. In both cases, the encoding used is "utf_32" and the error used is "replace". Here we give a program code of the string encoded and decoded in Python. The code is given below -

# Here, we initialize the string
string = "Hello everyone, Welcome to javatpoint"

# Here, we find the encoded string and print it
encode_string = string.encode('utf_32','replace')
print("The encoded string from the given string is: ", encode_string)

# Here we find decoded string and print it
decode_string = encode_string.decode('utf_32','replace')
print("The decoded string from the given string is: ", decode_string)

Output:

Now, we run the above code and find the encoded and decoded string in Python. The output is given below -

The encoded string from the given string is:  b'\xff\xfe\x00\x00H\x00\x00\x00e\x00\x00\x00l\x00\x00\x00l\x00\x00\x00o\x00\x00\x00 \x00\x00\x00e\x00\x00\x00v\x00\x00\x00e\x00\x00\x00r\x00\x00\x00y\x00\x00\x00o\x00\x00\x00n\x00\x00\x00e\x00\x00\x00,\x00\x00\x00 \x00\x00\x00W\x00\x00\x00e\x00\x00\x00l\x00\x00\x00c\x00\x00\x00o\x00\x00\x00m\x00\x00\x00e\x00\x00\x00 \x00\x00\x00t\x00\x00\x00o\x00\x00\x00 \x00\x00\x00j\x00\x00\x00a\x00\x00\x00v\x00\x00\x00a\x00\x00\x00t\x00\x00\x00p\x00\x00\x00o\x00\x00\x00i\x00\x00\x00n\x00\x00\x00t\x00\x00\x00'
The decoded string from the given string is:  Hello everyone, Welcome to javatpoint

Program code:

The Python's string decode() method uses "utf_32" as the encoding to obtain the length of the variable. If the error is specified as "backslashreplace" it will use the "backslashreplace" error. In the example below, the string "Hello everyone, Welcome to javatpoint". Create and encode using the encode() function. Now, take the encoded string, call the decode() function of the string, and use the print() function to output and print the decoded string. In both cases, the encoding used is "utf_16_be" and the "backslashreplace" is used as error. Here we give a program code of the string encoded and decoded in Python. The code is given below -

# Here, we initialize the string
string = "Hello everyone, Welcome to javatpoint"

# Here, we find the encoded string and print it
encode_string = string.encode('utf_16_be','backslashreplace')
print("The encoded string from the given string is: ", encode_string)

# Here we find decoded string and print it
decode_string = encode_string.decode('utf_16_be','backslashreplace')
print("The decoded string from the given string is: ", decode_string)

Output:

Now, we run the above code and find the encoded and decoded string in Python. The output is given below -

The encoded string from the given string is:  b'\x00H\x00e\x00l\x00l\x00o\x00 \x00e\x00v\x00e\x00r\x00y\x00o\x00n\x00e\x00,\x00 \x00W\x00e\x00l\x00c\x00o\x00m\x00e\x00 \x00t\x00o\x00 \x00j\x00a\x00v\x00a\x00t\x00p\x00o\x00i\x00n\x00t'
The decoded string from the given string is:  Hello everyone, Welcome to javatpoint

Program code:

The Python's string decode() function will use and execute the encoding default values without any parameters. In the example below, the string "Hello! Welcome to Tutorialspoint". Create and encode using the parameterless encode() function. Now take the encoded string cal,l the decode() function without string parameters, and use the print() function to output and print the decoded string. Here we give a program code of the string encoded and decoded in Python. The code is given below -

# Here, we initialize the string
string = "Hello everyone, Welcome to javatpoint"

# Here, we find the encoded string and print it
encode_string = string.encode()
print("Here the encoded string is: ", encode_string)

# Here we find decoded string and print it
decode_string = encode_string.decode()
print("Here the decoded string is: ", decode_string)

Output:

Now, we run the above code and find the encoded and decoded string in Python. The output is given below -

Here the encoded string is:  b'Hello everyone, Welcome to javatpoint'
Here the decoded string is:  Hello everyone, Welcome to javatpoint

Application of the encoded and decoded string:

While encoding and decoding together can be used for simple applications that store passwords in the backend, they can also be used together for many other applications that deal with data security, such as cryptography.

Program code:

Here we give a program code of application the encoded and decoded string in Python. The code is given below -

import base64 

# Here, we initialize the user_id and password  
user_id = "Stacey"
password = "woods_stacey"
  
# Here we converting the password into base64 encoding 
encoded_password = base64.b64encode(password.encode('utf-8')).decode('utf-8') 
  
login = "Stacey"
  
# Wrongly entered password 
wrong_password = "Stacey"
  
print("Password entered:", wrong_password) 
  
if wrong_password == base64.b64decode(encoded_password).decode('utf-8'): 
    print("You are successfully logged in to the page") 
else: 
    print("You are entering the wrong Password!!") 
  
print() 
  
# Here, we entered the password correctly
right_password = "adhikary_Stacey"
  
print("Password entered:", right_password) 
  
if right_password == base64.b64decode(encoded_password).decode('utf-8'): 
    print("You are successfully logged in to the page") 
else: 
    print("You are entering the wrong Password!!")

Output:

Now, we run the above code and find the encoded and decoded string in Python. The output is given below -

Password entered: Stacey
You are entering the wrong Password!!

Password entered: woods_stacey
You are successfully logged in to the page

Conclusion:

In this tutorial, we are learning about the Python Strings decode() method. Decoding and encoding strings in Python may seem daunting, but it is a simple process. Firstly, we need to determine the encoding type to be used for the given string. This can be done by examining the string itself or by looking for information or metadata that would provide this information. When we know the format of encoding, we can use Python's built-in module codec to decode the given string.

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