Clash Royale CLAN TAG#URR8PPP

Check if all files are there in directory before proceeding to execute the remaining code?

I'm trying to make sure that all the files(here in my case 'ccf_table','bis_file') are there in the directory before the code proceed to start the computations. And if either of them(bis_file,ccf_table) is not there in directory for any of the input file('filename' in my case) then just simply pass that input file.

path = "/home/Desktop/s1d_data"
for filename in os.listdir(path):
if filename.endswith("_s1d_A.fits"):
s1d_hdu = fits.open(filename)
s1d_header = s1d_hdu[0].header
date = s1d_header['DATE-OBS']
date2 = date = date[0:19]
ccf_table = glob('HARPS.' + date2 + '*_ccf_G2_A.tbl')
bis_file = glob('HARPS.' + date2 + '*_bis_G2_A.fits')

filelist = ['ccf_table','bis_file']
while True:
list1 =
for file in filelist:
list1.append(os.path.isfile(file))

if all(list1):
break
else:
pass

df=pd.read_table(ccf_table[0],skiprows=2,usecols=(0,4),names=['order','rv'],)
df = df.rv.mean()
out_name = s1d_header['OBJECT'] +'-' + s1d_header['DATE-OBS'] +'.fits'


That's what i've tried until now but didn't get the desired result.Any help would be appreciated.

os.path.isfile

2 Answers
2

Assuming you have the following imports,

import os
import sys
from pathlib import Path


Get the source directory, and resolve the desired path,

src_dir = os.path.dirname(os.path.realpath(sys.argv[0]))
my_dir = src_dir + '\..\repos\notebooks\data\'

path = Path.resolve(Path(src_dir + 'riverbank.jpg'))


To check if a file exists use path.exists(), or something more thorough,

path.exists()

if os.path.isfile(path) and os.access(path, os.R_OK):
print "File exists and is readable"
else:
print "File is missing or unreadable"


Then, you can iterate through a list of files, update a flag and break out if a file cannot be read as follows,

my_files = [ 'riverbank.jpg', ... ]

success = True

for name in my_files:
path = Path.resolve(Path(my_dir + name))
if not (os.path.isfile(path) and os.access(path, os.R_OK)):
success = False
print(path)
break

if success:
print("Files exist and are readable")
else:
print("A file is missing or unreadable")


You could extend this by printing out this file name or by continuing through the file list and providing the user with a list of missing/inaccessible files.

Well, thanks for the help everyone but i managed to solve this problem on my own by using an another approach. So i thought it's better to share how i solved it.

for filename in os.listdir("/home/Desktop/2d_spectra"):
if filename.endswith("_e2ds_A.fits"):
e2ds_hdu = fits.open(filename,ignore_missing_end=True)
e2ds_header = e2ds_hdu[0].header
blaze_file = e2ds_header['HIERARCH ESO DRS BLAZE FILE']
date = e2ds_header['DATE-OBS']
date2 = date = date[0:19]
blaze_file1 = glob(blaze_file)
bis_file = glob('HARPS.' + date2 + '*_bis_G2_A.fits')
ccf_table = glob('HARPS.' + date2 + '*_ccf_G2_A.tbl')

ll = np.size([blaze_file1]) + np.size(bis_file) + np.size(ccf_table) # will convert the string to numpy array
if ll == 3:
#did what i wanted to do.

else:
none


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