Python file fscanf

It basically reads from a file also contain a pointer i. Above is the syntax for declaring the fscanf function in C.

It takes two parameters i. This function in C language is used to read a specific part of the from the file instead of reading the whole stream. For this, it uses a file pointer. This function takes two parameter streams and formats. This stream is the pointer to the file and format contain a list of placeholder which is used to read the specific type of data.

But in scientific notation. But this floating number can be exponential or in decimal format depends upon the size of the input. It is used to read the integer value. The closest way to do it is to read the file line by line and use regular expressions.

Numpy the Matlab-like Python library , however, has a function that allows to read a file and construct an array from is content : numpy. If you need something more complex i. I think Wookai answer is incorrect. I think numpy. Have you taken a look at numpy? By the way, fscanf internally stores the data in column order - So I don't think there will be any efficiency gain. I think the pythonic way to do it would be to open the file and read in the data into a list of list s using list comprehensions.

I'm using data from a string for clarity, and reading it in as if from a file using StringIO. How are we doing? Please help us improve Stack Overflow.

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Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? As you can see, it is just shy of a three times as fast as numpy.

This is of course much less general than numpy. Now for the surprising part. I imagined that since fscanf has been a part of libc for so very long, it would be about as fast as it is possible to be.

But I was wrong. This gives nearly a three times speedup over the fscanf loop, even including the overhead of loading up python and importing pandas! At this point I became curious about how quickly a lean C program could parse the text file if instead of using fscanf I used a custom ascii-to-floating-point parser.

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