How to Read 3 Bytes as Int

In this Python tutorial, nosotros will learn how to read a binary file in python, and also we will encompass these topics:

• How to read a binary file to an assortment in Python
• How to read a binary file into a byte array in Python
• How to read a binary file line by line in Python
• Python read a binary file to Ascii
• How to read a binary file into a NumPy array in Python
• How to read a binary file into CSV in Python

Python read a binary file

Hither, we will come across how to read a binary file in Python.

• Before reading a file we accept to write the file. In this example, I take opened a file using file = open("certificate.bin","wb") and used the "wb" mode to write the binary file.
• The document.bin is the name of the file.
• I accept taken a variable every bit a judgement and assigned a sentence "This is good", To decode the sentence, I have used judgement = bytearray("This is good".encode("ascii")).
• And to write the judgement in the file, I have used the file.write() method.
• The write() is used to write the specified text to the file. And then to close the file, I have used the file.close().

Instance to write the file:

          file = open("document.bin","wb") judgement = bytearray("This is proficient".encode("ascii")) file.write(judgement) file.close()                  

• To read the file, I have taken the already created file certificate.bin and used the "rb" mode to read the binary file.
• The document.bin is the file proper noun. And, I have using the read() method. The read() method returns the specified number of bytes from the file.

Instance to read the file:

          file = open("certificate.bin","rb") print(file.read(4)) file.close()        

In this output, yous tin encounter that I have used print(file.read(4)). Here, from the sentence, information technology volition read only iv words. Every bit shown in the output.

Python read a binary file

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Python read a binary file to an array

Here, we tin can come across how to read a binary file to an assortment in Python.

• In this example, I have opened a file as assortment.bin and used the "wb" mode to write the binary file. The assortment.bin is the name of the file.
• And assigned an array equally num=[two,four,6,eight,10] to get the assortment in byte converted format, I take used bytearray(). The bytearray() method returns the byte array objects.
• To writes the assortment in the file, I have used the file.write(). And file.close() to close the file.

Example to write an array to the file:

          file=open("array.bin","wb") num=[two,iv,6,eight,10] assortment=bytearray(num) file.write(assortment) file.shut()        

• To read the written array from the file, I have used the aforementioned file i.e,file=open("array.bin","rb").
• The "rb" mode is used to read the array from the file.
• The list() function is used to create the list object number=list(file.read(3)). The file.read() is used to read the bytes from the file.
• The file.read(3) is used to read-only 3 numbers from the assortment. The file.close() is used to close the file.

Example to read an array from the file:

          file=open("array.bin","rb") number=list(file.read(3)) print (number) file.close()        

To go the output, I take used print(number). And to close the file, I take used file.shut(). In the beneath screenshot you can see the output.

Python read a binary file to an array

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Python read a binary file into a byte assortment

Now, we tin see how to read a binary file into a byte array in Python.

• In this example, I have opened a file chosen sonu.bin and "rb" mode is used to read a binary file, and sonu.bin is the proper name of the file. Here, I have stored some information in the sonu.bin file.
• The byte = file.read(three) is used to read the file, and file.read(3) is used to read only 3 bytes from the file.
• The while loop is used to read and iterate all the bytes from the file.

Example:

          file = open("sonu.bin", "rb") byte = file.read(three) while byte:     print(byte)     byte = file.read(iii)        

To read the byte from the file, I take used print(byte). Yous can refer to the below screenshot for the output.

Python read a binary file into a byte assortment

Python read a binary file line by line

Hither, we tin meet how to read a binary file line by line in Python.

• In this example, I have taken a line every bit lines=["Welcome to python guides\north"] and open a file named as file=open("document1.txt","wb") document1.txt is the filename.
• The "wb" is the mode used to write the binary files. The file.writelines(lines) is used to write the lines from the file.
• The writelines() returns the sequence of cord to the file. The file.close() method is used to close the file.

Example to write the file:

          lines=["Welcome to python guides\n"] file=open("document1.txt","wb") file.writelines(lines) file.close()        

• To read the written file, I accept used the same filename as document1.txt, I take used file=open("document1.txt","rb") to open up the file, "rb" style is used to read the binary file and, To read the line from the file I have used line=file.readline().
• The readline() returns one line from the file.

Case to read the file:

          file=open("document1.txt","rb") line=file.readline() print(line) file.close()        

To get the output, print(line) is used and lastly to close the file, I have used file.close().

Python read a binary file line by line

Python read a binary file to Ascii

At present, we can run into how to read a binary file to Ascii in Python.

• In this example, I have opened a file named test.bin using file = open up('test.bin', 'wb'), The 'wb' mode is used to write the binary file and I have taken a variable as a sentence and assigned a judgement = 'Hello Python'. To encode the judgement.
• I have used file_encode = sentence.encode('ASCII'). To write the encoded sentence in the file, I have used the file.write(file_encode).
• The file.seek() method returns the new position. To read the written file, I have used the file.read() which returns a byte from the file.
• And so to catechumen the binary sentence into Ascii, I have used new_sentence = bdata. decode('ASCII').

Instance:

          file = open('examination.bin', 'wb') judgement = 'Hullo Python' file_encode = sentence.encode('ASCII') file.write(file_encode) file.seek(0) bdata = file.read() print('Binary sentence', bdata) new_sentence = bdata.decode('ASCII') print('ASCII sentence', new_sentence)        

To become the output as an encoded sentence, I accept used impress('ASCII sentence', new_sentence). You tin can refer to the beneath screenshot for the output.

Python read a binary file to Ascii

Python read a binary file into a NumPy assortment

Here, we can run across how to read a binary file into a numpy array in Python.

• In this case, I have imported a module called NumPy. The array = np.array([ii,8,7]) is used to create an array, The .tofile is used to write all the assortment to the file. The array.bin is the name of the binary file.
• The np.fromfile is used to construct an array from the information in the file. The dtype=np.int8 is the datatype object. The output of the assortment changes if we change np.int8 to int32 or int64.

Example:

          import numpy as np array = np.array([2,eight,vii]).tofile("assortment.bin") print(np.fromfile("array.bin",  dtype=np.int8))        

To get the output, I take used print(np.fromfile("array.bin", dtype=np.int8)). The below screenshot shows the output.

Python read a binary file into a NumPy array

Python read a binary file into CSV

Here, nosotros tin can meet how to read binary file into csv in Python.

• In this example, I have imported a module called CSV. The CSV module is a comma-separated value module. It is used to read and write tabular data in CSV format.
• I have opened a file called lock.bin and "west" mode is used to write the file writer = csv.author(f) is used to write the objects in the file. The lock.bin is the name of the file.
• The writer() returns the write object which converts data into a string.
• The author.writerows is used to write all the rows into the file. To close the file, f.close() is used.

Example to write the csv file:

          import csv f = open up("lock.bin", "w") writer = csv.writer(f) writer.writerows([["a", 1], ["b", two], ["c", 3], ["d",4]]) f.close()                  

To read the CSV file, I have opened the file lock.bin in which data is already written, The 'r' mode is used to read the file. To read the CSV file, I take used reader = csv.reader(file) to render a listing of rows from the file.

Example to read the csv file:

          import csv with open('lock.bin', 'r') equally file:     reader = csv.reader(file)     for row in reader:         impress(row)                  

To go the output I have used print(row). The beneath screenshot shows the output.

Python read a binary file into CSV

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In this tutorial we have learned about Python read a binary file, besides we have covered these topics:

• Python read a binary file to an array
• Python read a binary file into a byte array
• Python read a binary file line by line
• Python read a binary file to Ascii
• Python read a binary file into a NumPy array
• Python read a binary file into CSV

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