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I have a file containing python's object as string, then i open it and doing things like i showing:
>>> file = open('gods.txt')
>>> file.readlines()
["{'brahman': 'impersonal', 'wishnu': 'personal, immortal', 'brahma': 'personal, mortal'}\n"]
But then i have problem because there is no longer any lines:
>>> f.readlines()
[]
>>> f.readline(0)
''
Why it is heppening and how can i stay with access to file's lines?
983
The readline() method helps to read just one line at a time, and it returns the first line from the file given. We will make use of readline() to read all the lines from the file given. To read all the lines from a given file, you can make use of Python readlines() function.
Method 1: fileobject.readlines() A file object can be created in Python and then readlines() method can be invoked on this object to read lines into a stream. This method is preferred when a single line or a range of lines from a file needs to be accessed simultaneously.
Method 1: Read a File Line by Line using readlines() readlines() is used to read all the lines at a single go and then return them as each line a string element in a list. This function can be used for small files, as it reads the whole file content to the memory, then split it into separate lines.
readline() reads a single line -- the next line in the context of the iterator returned by open() .
Your position in the file has moved
f = open("/home/usr/stuff", "r")
f.tell()
# shows you're at the start of the file
l = f.readlines()
f.tell()
# now shows your file position is at the end of the file
readlines() gives you a list of contents of the file, and you can read that list over and over. It's good practice to close the file after reading it, and then use the contents you've got from the file. Don't keep trying to read the file contents over and over, you've already got it.
22
There's only one line in that file, and you just read it. readlines returns a list of all the lines. If you want to re-read the file, you have to do file.seek(0)
133
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