from astropy.io import fits
#This is what the file is called
hdulist = fits.open('acisf02149N003_evt2.fits.gz')
hdulist.info()
tbdata = hdulist[1].data

#This prints it out into a text file
f=open('ChandraXraysources.txt','w+')

#This chooses only the detx, dety, and energy columns I was talking about
detxvect=tbdata.field('detx')
detyvect=tbdata.field('dety')
detzvect=tbdata.field('energy')

#This lists at the top of the text file the names of each column
f.write('Chandra X-ray source, RA(x),dec(y),energy  rn')

for i in range(len(detxvect)):
    f.write('%e  %e  %ern' %(detxvect[i],detyvect[i],detzvect[i]))

print(detxvect[0])