#!/usr/bin/env python

# import required modules
#
import os
import sys

# main: this is the main function of this Python
#
def main(argv):

    # simple loops
    #
    #    i = int(0)
    #    for arg in argv:
    #        print("argv[%8d %10.4f] = %s" % (i, float(i), arg))
    #        # another way to print
    #        #
    #        print(argv[i])
    #        i += int(1)

    # first method
    #
    lines = []
    with open(argv[1]) as f:
        for line in f:

            # strip the new line character
            #
            #print("before strip ...>", line)
            foo = line.rstrip('\n')
            #print("after strip ...>", foo)
            
            # find the first non-whitespace
            #
            if (len(foo) != 0) and (foo[0] != '#'):
                lines.append(foo)

    # close the file
    #
    f.close()

    #print("------ before reading -------------")
    print(lines)
    #Print("------ done reading -------------")

    # iterate over lines and break into parts
    #
    #print("------ starting parsing -------------")
    #for line in lines:
        #print("*> splitting: %s" % line)
        #parts = line.split()
        #print("...>")
        #print(parts)
        #print("...<")
        #parts = line.split('=')
        #print("***", parts[0], " = ", parts[1])
        #print("------ end of parsing -------------")

    # second method
    #
    print("------ second method  -------------")
    print("------ second method  -------------")
    print("------ second method  -------------")

    lines = []
    for line in open(sys.argv[1],'r').readlines():
        foo = line.rstrip('\n')
        lines.append(foo)
        #print("2nd method: ", foo)
    print(lines)
    print(".....   end of second method   .......")
    print(".....   end of second method   .......")
    print(".....   end of second method   .......")

    # third method
    #
    print("------ third method  -------------")
    print("------ third method  -------------")
    lines = [line.rstrip('\n') for line in open(sys.argv[1])]
    print("3rd method: ", lines)
    print("------ end of third method  -------------")

    print("   ")
    print("   ")
    print("   ")
    #---
    # let's put all this together and write code that opens a file,
    # detects if the first nonwhitespace character is a '#',
    # and if not, splits the line and gets the name and value
    #---

    # open the file with error checking
    #
    try:
        f = open(sys.argv[1])
    except:
        print("***> error opening file... exiting...")
        exit(-1)

    with f:
    
        # read the file into memory
        #
        lines = [line.rstrip('\n') for line in f]
        print("***>", lines)

        # close the file
        #
        f.close()

    print("------ end of fourth method  -------------")

    # loop over the data and only process the lines that don't
    # begin with a comment character
    #
    for line in lines:
        
        # remove spaces and newline chars
        #
        # line = line.replace(' ', '').replace('\n', '').replace('\t', '')
        line = line.replace('\n', '').replace('\t', '')
        
        # check if the line starts with comments: if it does, skip it, else
        # process it
        #
        if line.startswith('#') or len(line) == 0:
            pass
        else:
            # split the line by an inline comment character
            #
            #parts = line.split()
            #print(parts)
            
            # split the first part of the line into name/value pairs
            #
            values = line.split('=')
            print(values)
            
            # display the result
            #
            sum = float(values[1])
            print('******> name = ', values[0], '***> value = ', sum)
            
# begin gracefully
#
if __name__ == "__main__":
    main(sys.argv)

#
# end of file