Python File Opening with a variable

Question

I am a beginner in python . why the variable "env" being used while opening the file and other places in the following code . From the tutorials i have seen file opening formats were always like with open(filename) as f , but here a variable name is being used. Please explain .

def main():
    global debug, testing,env, mode
    newID=0
    rv=[]
    name=''

    if "debug" in sys.argv:
        debug = True
    if "testing" in sys.argv:
        testing = True
    if debug:
        print(sys.argv)

    if "copyAccountProfile" in sys.argv:
        mode = 'copyAccountProfile' 

    envProfile = sys.argv[1]
 
    if debug:
        print(envProfile)

    with open(envProfile) as f_in: 
        lineList = list(line for line in (l.strip() for l in f_in) if line)
#    ff = open(envProfile)
#    lineList = [line for line in ff.readlines() if line.strip()]
    for line in lineList:
        if line.startswith('#'):
            continue
        [nm, v]=line.strip().split('=')
        env[nm.strip()]=v.strip()
        if debug:
            print(env)

    with open(env['accountProfile']) as f_in: 
        accountList = list(line for line in (l.strip() for l in f_in) if line)
    if mode == 'copyData':  
        for acc in accountList:
            [name,Id] = acc.strip().split(',')
            name = name.strip()
            #copyData(name, env['src_ror'], workingDir, env['dst_ror'], workingDir, 'bk_files', True)         
            copyData(name, env['src_ror'], workingDir, env['dst_ror'], workingDir, 'bk_files')         
            copyData(name, env['src_ror'], workingDir, env['dst_bpm'], backupDir, 'bk_files')         
            copyData(name, env['src_bpm'], workingDir, env['dst_bpm'], workingDir, 'ft_files')         
            localCopyData(name, env['dst_bpm'], workingDir, backupDir) 
    else:
    #copy updated accountProfile from dst_ror to dst_bpm
        fname = env['accountProfile']
        # src = ip:port, dst = ip:port}
        [sIp, sPort]=env['dst_ror'].split(':')
        [dIp, dPort]=env['dst_bpm'].split(':')
        copyFile(fname, sIp, sPort, toolDir, dPort, dIp, toolDir)

Tyler · Accepted Answer · 2020-12-28 18:28:10Z

1

Welcome Prema. Variable names can be anything the author wishes them to be. Generally, a programmer should use descriptive variable names that relate to the data being stored in that variable.

Since this example is poorly documented, I'll have to assume that the author used "env" to show that this variable is somehow connected to an environment of some sort.

This author seems to be using the "f_in" variable name to indicate the file is an input file.

answered Dec 28, 2020 at 18:28

Tyler

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