Read ascii file python

The output should now look something like this:. Each line is being returned as a string. If we just type line we should see the last line that was printed in the loop:. We can extract these with:. Note that j is a string, but if we want a floating point number, we can instead do:. One last piece of information we need about files is how we can read a single line. This is done using:. We can put all this together to write a little script to read the data from the file and display the columns we care about to the screen!

Here is is:. After this script is run, how would you access the name and J-band magnitude of the third source? For each line, we are then creating an empty dictionary and populating it with variables we care about:. Finally, we append this source to the data list:. Therefore, data is a list of dictionaries:. Then simply use f. If you want to write multiple lines, you can either give a list of strings to the writelines method:. Using at most seven lines, write a script which will read in data.

This is important base knowledge, but in real-world use when dealing with ASCII data files there are many complications and we recommend using the astropy. It natively understands and can automatically detect most of the formats which astronomers typically encounter. Ignacio Vazquez-Abrams Ignacio Vazquez-Abrams k gold badges silver badges bronze badges. The problem is that the file has both tab and space delimiters.

Not according to what you pasted. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. To get the output, I have used print number. And to close the file, I have used file. In the below screenshot you can see the output. To read the byte from the file, I have used print byte.

You can refer to the below screenshot for the output. To get the output, print line is used and lastly to close the file, I have used file. For example, to open a file whose name is the-zen-of-python. The open function returns a file object which you will use to read text from a text file. To close the file automatically without calling the close method, you use the with statement like this:. The following example illustrates how to use the read method to read all the contents of the the-zen-of-python.