How to encode text to base64 in python
PythonPython 3.xEncodingBase64Python Problem Overview
I am trying to encode a text string to base64.
i tried doing this :
name = "your name"
print('encoding %s in base64 yields = %s\n'%(name,name.encode('base64','strict')))
But this gives me the following error:
LookupError: 'base64' is not a text encoding; use codecs.encode() to handle arbitrary codecs
How do I go about doing this ? ( using Python 3.4)
Python Solutions
Solution 1 - Python
Remember to import base64 and that b64encode takes bytes as an argument.
import base64
base64.b64encode(bytes('your string', 'utf-8'))
Solution 2 - Python
It turns out that this is important enough to get it's own module...
import base64
base64.b64encode(b'your name') # b'eW91ciBuYW1l'
base64.b64encode('your name'.encode('ascii')) # b'eW91ciBuYW1l'
Solution 3 - Python
-
This works without imports in Python 2:
>>> >>> 'Some text'.encode('base64') 'U29tZSB0ZXh0\n' >>> >>> 'U29tZSB0ZXh0\n'.decode('base64') 'Some text' >>> >>> 'U29tZSB0ZXh0'.decode('base64') 'Some text' >>>
(although this doesn't work in Python3 )
- In Python 3 you'd have to import base64 and do base64.b64decode('...')
- will work in Python 2 too.
Solution 4 - Python
For py3, base64 encode and decode string:
import base64
def b64e(s):
return base64.b64encode(s.encode()).decode()
def b64d(s):
return base64.b64decode(s).decode()
Solution 5 - Python
To compatibility with both py2 and py3
import six
import base64
def b64encode(source):
if six.PY3:
source = source.encode('utf-8')
content = base64.b64encode(source).decode('utf-8')
Solution 6 - Python
It looks it's essential to call decode() function to make use of actual string data even after calling base64.b64decode over base64 encoded string. Because never forget it always return bytes literals.
import base64
conv_bytes = bytes('your string', 'utf-8')
print(conv_bytes) # b'your string'
encoded_str = base64.b64encode(conv_bytes)
print(encoded_str) # b'eW91ciBzdHJpbmc='
print(base64.b64decode(encoded_str)) # b'your string'
print(base64.b64decode(encoded_str).decode()) # your string
Solution 7 - Python
Whilst you can of course use the base64 module, you can also to use the codecs module (referred to in your error message) for binary encodings (meaning non-standard & non-text encodings).
For example:
import codecs
my_bytes = b"Hello World!"
codecs.encode(my_bytes, "base64")
codecs.encode(my_bytes, "hex")
codecs.encode(my_bytes, "zip")
codecs.encode(my_bytes, "bz2")
This can come in useful for large data as you can chain them to get compressed and json-serializable values:
my_large_bytes = my_bytes * 10000
codecs.decode(
codecs.encode(
codecs.encode(
my_large_bytes,
"zip"
),
"base64"),
"utf8"
)
Refs:
Solution 8 - Python
Use the below code:
import base64
#Taking input through the terminal.
welcomeInput= raw_input("Enter 1 to convert String to Base64, 2 to convert Base64 to String: ")
if(int(welcomeInput)==1 or int(welcomeInput)==2):
#Code to Convert String to Base 64.
if int(welcomeInput)==1:
inputString= raw_input("Enter the String to be converted to Base64:")
base64Value = base64.b64encode(inputString.encode())
print "Base64 Value = " + base64Value
#Code to Convert Base 64 to String.
elif int(welcomeInput)==2:
inputString= raw_input("Enter the Base64 value to be converted to String:")
stringValue = base64.b64decode(inputString).decode('utf-8')
print "Base64 Value = " + stringValue
else:
print "Please enter a valid value."
Solution 9 - Python
> Base64 encoding is a process of converting binary data to an ASCII > string format by converting that binary data into a 6-bit character > representation. The Base64 method of encoding is used when binary > data, such as images or video, is transmitted over systems that are > designed to transmit data in a plain-text (ASCII) format.
Follow this link for further details about understanding and working of base64 encoding.
For those how wants implement base64 encoding from scratch for sake of understanding. Here's the code that encodes the string to base64.
encoder.py
#!/usr/bin/env python3.10
class Base64Encoder:
#base64Encoding maps integer to the encoded text since its a list here the index act as the key
base64Encoding:list = None
#data must be type of str or bytes
def encode(data)->str:
#data = data.encode("UTF-8")
if not isinstance(data, str) and not isinstance(data, bytes):
raise AttributeError(f"Expected {type('')} or {type(b'')} but found {type(data)}")
if isinstance(data, str):
data = data.encode("ascii")
if Base64Encoder.base64Encoding == None:
#construction base64Encoding
Base64Encoder.base64Encoding = list()
#mapping A-Z
for key in range(0, 26):
Base64Encoder.base64Encoding.append(chr(key + 65))
#mapping a-z
for key in range(0, 26):
Base64Encoder.base64Encoding.append(chr(key + 97))
#mapping 0-9
for key in range(0, 10):
Base64Encoder.base64Encoding.append(chr(key + 48))
#mapping +
Base64Encoder.base64Encoding.append('+')
#mapping /
Base64Encoder.base64Encoding.append('/')
if len(data) == 0:
return ""
length=len(data)
bytes_to_append = -(length%3)+(3 if length%3 != 0 else 0)
#print(f"{bytes_to_append=}")
binary_list = []
for s in data:
ascii_value = s
binary = f"{ascii_value:08b}"
#binary = bin(ascii_value)[2:]
#print(s, binary, type(binary))
for bit in binary:
binary_list.append(bit)
length=len(binary_list)
bits_to_append = -(length%6) + (6 if length%6 != 0 else 0)
binary_list.extend([0]*bits_to_append)
#print(f"{binary_list=}")
base64 = []
value = 0
for index, bit in enumerate(reversed(binary_list)):
#print (f"{bit=}")
#converting block of 6 bits to integer value
value += ( 2**(index%6) if bit=='1' else 0)
#print(f"{value=}")
#print(bit, end = '')
if (index+1)%6 == 0:
base64.append(Base64Encoder.base64Encoding[value])
#print(' ', end="")
#resetting value
value = 0
pass
#print()
#padding if there is less bytes and returning the result
return ''.join(reversed(base64))+''.join(['=']*bytes_to_append)
testEncoder.py
#!/usr/bin/env python3.10
from encoder import Base64Encoder
if __name__ == "__main__":
print(Base64Encoder.encode("Hello"))
print(Base64Encoder.encode("1 2 10 13 -7"))
print(Base64Encoder.encode("A"))
with open("image.jpg", "rb") as file_data:
print(Base64Encoder.encode(file_data.read()))
Output:
$ ./testEncoder.py
SGVsbG8=
MSAyIDEwIDEzIC03
QQ==