error "foreach: Too many arguments." when too many files to be linked

[IncubatorShokuhou]

I met foreach: Too many arguments. while trying to link a whole year of fnl data using link_grib.csh. It seems that there are too many files (according to https://www.experts-exchange.com/questions/10210401/foreach-limit.html).

I simply rewrite the link_grib.csh with python, which has exactly the same usage as link_grib.csh.

#! /usr/bin/python
import sys,glob,os
def link_grib_file(filelist):
    n = 0
    for ifile in filelist:
        if ( ifile != "."):
            file_suffix = file_alphabet(n)
            os.symlink(ifile, "GRIBFILE."+file_suffix)
            n+=1
def file_alphabet(number):
    alpha=['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z']
    if number >= 26*26*26:
        print("RAN OUT OF GRIB FILE SUFFIXES!")
        exit()
    else:
        i1=number%26
        i2=(number-i1)//26%26
        i3=(number-i2*26-i1)//26//26%26
        return alpha[i3]+alpha[i2]+alpha[i1]
if __name__ == "__main__":
    varlist = sys.argv[1:]
    if (len(varlist)==1) or (len(varlist)==2 and varlist[1]=='.'):
        os.system("rm -f GRIBFILE.???")
        filelist=glob.glob(varlist[0])
        link_grib_file(filelist)
    elif (len(varlist)>1):
        os.system("rm -f GRIBFILE.???")
        filelist=varlist
        link_grib_file(filelist)
    elif (len(varlist)==0):
        print(" " ) 
        print(" " ) 
        print("   Please provide some GRIB data to link") 
        print("   usage: ./link_grib.py path_to_grib_data/grib_data_root") 
        print(" " ) 
        print(" " ) 

I'm wondering if it is helpful.
PS. It seems that the python code is about ten times faster than csh (maybe due to using os.symlink instead of ln -sf)