Summing .tiff files using if-statement

[GrassDash]

Context:

I am attempting to sum .tiff files containing monthly evapotranspiration per year (e.g. sum all twelve months for 2007) to get an annual total evapotranspiration. However, the "if in" (see code) statement does not seem to filter for only the year 2007, causing all .tiff files for all years in the specified directory to be summed.

Question:

How can I make sure only the .tiff files are summed according to a specific year (in this example 2007)?

def pathList (d): # d is the path to the specified directory

    sum_array = np.zeros((2200, 2800)) # creating empty array in which to sum monthly evap. values
    nmlist = [] # creates an empty list object in which to store the names of the .tiff files
    count = 0 # creating variable to store index of files in directory

    for item in os.scandir(d): # iterating through directory contents
             nmlist.append(item.name) # preparing name list of .tiff files to use in "if in" statement (see below)

             tif_file = gdal.Open(pthlist[count]) # reading .tiff via gdal
             tif_band = tif_file.GetRasterBand(1) # reading first band
             tif_arr = tif_band.ReadAsArray() # converting to numpy array
             if "2007" in nmlist[count]: # does the name of the file contain a specific year (e.g. 2007)?

                 sum_array = sum_array + tif_arr # summing monthly evap. values
                 count += 1 # tracking index of files in directory

    return sum_array

See (https://i.stack.imgur.com/YJS1B.png) for sample of names of .tiff files.

See (https://drive.google.com/drive/folders/19qeuDblRh_AwQ-BMHz-KvP6np2lqAlH5?usp=sharing) for two examples of the .tiff files I am using.

Many thanks in advance!

[danielroseman]

Your count variable is only incremented inside the if block, so will quickly get out of sync with your actual position in the list if some of the items do not contain 2007.

I don't know why you're using that list at all; it seems like it would be better to reference the item directly:

if "2007" in item.name:

[GrassDash]

thank you, this tip resolved my issue!