Answers for "python file io"

Python

python file open modes

r for reading
r+ opens for reading and writing (cannot truncate a file)
w for writing
w+ for writing and reading (can truncate a file)
rb for reading a binary file. The file pointer is placed at the beginning of the file.
rb+ reading or writing a binary file
wb+ writing a binary file
a+ opens for appending
ab+ Opens a file for both appending and reading in binary. The file pointer is at the end of the file if the file exists. The file opens in the append mode.
x open for exclusive creation, failing if the file already exists (Python 3)

Posted by: Guest on June-06-2020

python write to file

with open(filename,"w") as f:
  f.write('Hello World')

Posted by: Guest on March-30-2020

python file open

#there are many modes you can open files in. r means read.
file = open('C:Usersyournamefilesfile.txt','r')
text = file.read()

#you can write a string to it, too!
file = open('C:Usersyournamefilesfile.txt','w')
file.write('This is a typical string')

#don't forget to close it afterwards!
file.close()

Posted by: Guest on March-26-2020

python3 seek

>>> f = open('workfile', 'rb+')
>>> f.write(b'0123456789abcdef')
16
>>> f.seek(5)      # Go to the 6th byte in the file
5
>>> f.read(1)
b'5'
>>> f.seek(-3, 2)  # Go to the 3rd byte before the end
13
>>> f.read(1)
b'd'

Posted by: Guest on January-09-2020

how to write to an output file in pytion

#first arg is the name of the file
#second arg notes that the file is open to write to it
outputFile = open("fileName", "w")
#next line writes to the file
outputFile.write(str)
#remember to close opened files
outputFile.close()

Posted by: Guest on December-31-2020

Source

python write to file

with open("testfile.txt", "w") as f:
  # "w" - write into file
  # "r" - read into file
  # "+" - read and write into file
  f.write("Hello World")

Posted by: Guest on January-09-2021

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