[Python] Python generating a text file with a way larger size than expected

I am trying to write the data recorded through a microphone into a text file for encryption.

Here is my code,

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
RECORD_SECONDS = 5

p = pyaudio.PyAudio()

stream = p.open(format=FORMAT,
channels=CHANNELS,
rate=RATE,
input=True,
frames_per_buffer=CHUNK)

frames = []

for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
data = stream.read(CHUNK)
frames.append(data)

with open("Original_Data.txt", 'wb') as outFile:
for frame in frames:
outFile.write(str(frame))


Clearly, the audio data is stored in a list:

frames[]


There will be total of (44100/1024)*5 = 215 CHUNKS, so 215*1024 = 220160 bits.

The file size should be,

220161 bits = 220161/8 = 27520 bytes


But the file that is created after the above code execute has a size of approximately 880640 bytes.

Why is this happening?

What I can anticipate is that, it is happening at the line when I am writing the data into a text file,

with open("Original_Data.txt", 'wb') as outFile:
for frame in frames:
outFile.write(str(frame))


But I am still not sure. Why is it happening?

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