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annotate 0.7.0/bin/get_top_unique_mash_hit_genomes.py @ 19:4b304d77bbfb

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planemo upload
author kkonganti
date Mon, 15 Jul 2024 11:20:22 -0400
parents 0e7a0053e4a6
children
rev   line source
kkonganti@17 1 #!/usr/bin/env python3
kkonganti@17 2
kkonganti@17 3 # Kranti Konganti
kkonganti@17 4
kkonganti@17 5 import argparse
kkonganti@17 6 import glob
kkonganti@17 7 import inspect
kkonganti@17 8 import logging
kkonganti@17 9 import os
kkonganti@17 10 import pickle
kkonganti@17 11 import pprint
kkonganti@17 12 import re
kkonganti@17 13 import subprocess
kkonganti@17 14 from collections import defaultdict
kkonganti@17 15
kkonganti@17 16
kkonganti@17 17 # Multiple inheritence for pretty printing of help text.
kkonganti@17 18 class MultiArgFormatClasses(argparse.RawTextHelpFormatter, argparse.ArgumentDefaultsHelpFormatter):
kkonganti@17 19 pass
kkonganti@17 20
kkonganti@17 21
kkonganti@17 22 # Main
kkonganti@17 23 def main() -> None:
kkonganti@17 24 """
kkonganti@17 25 This script works only in the context of a Nextflow workflow.
kkonganti@17 26 It takes:
kkonganti@17 27 1. A pickle file containing a dictionary object where genome accession
kkonganti@17 28 is the key and the computed serotype is the value.
kkonganti@17 29 OR
kkonganti@17 30 1. It takes a pickle file containing a nested dictionary, where genome accession
kkonganti@17 31 is the key and the metadata is a dictionary associated with that key.
kkonganti@17 32 2. A file with `mash screen` results.
kkonganti@17 33 3. A directory containing genomes' FASTA in gzipped format where the
kkonganti@17 34 FASTA file contains 2 lines: one FASTA header followed by
kkonganti@17 35 genome Sequence.
kkonganti@17 36 and then generates a concatenated FASTA file of top N unique `mash screen`
kkonganti@17 37 genome hits as requested.
kkonganti@17 38
kkonganti@17 39 In addition:
kkonganti@17 40 1. User can skip `mash screen` hits that originate from the supplied
kkonganti@17 41 bio project accessions.
kkonganti@17 42 For -skip option to work, ncbi-datasets should be available in $PATH.
kkonganti@17 43 """
kkonganti@17 44
kkonganti@17 45 # Set logging.
kkonganti@17 46 logging.basicConfig(
kkonganti@17 47 format="\n" + "=" * 55 + "\n%(asctime)s - %(levelname)s\n" + "=" * 55 + "\n%(message)s\n\n",
kkonganti@17 48 level=logging.DEBUG,
kkonganti@17 49 )
kkonganti@17 50
kkonganti@17 51 # Debug print.
kkonganti@17 52 ppp = pprint.PrettyPrinter(width=55)
kkonganti@17 53 prog_name = os.path.basename(inspect.stack()[0].filename)
kkonganti@17 54
kkonganti@17 55 parser = argparse.ArgumentParser(
kkonganti@17 56 prog=prog_name, description=main.__doc__, formatter_class=MultiArgFormatClasses
kkonganti@17 57 )
kkonganti@17 58
kkonganti@17 59 parser.add_argument(
kkonganti@17 60 "-s",
kkonganti@17 61 dest="sero_snp_metadata",
kkonganti@17 62 default=False,
kkonganti@17 63 required=False,
kkonganti@17 64 help="Absolute UNIX path to metadata text file with the field separator, | "
kkonganti@17 65 + "\nand 5 fields: serotype|asm_lvl|asm_url|snp_cluster_id"
kkonganti@17 66 + "\nEx: serotype=Derby,antigen_formula=4:f,g:-|Scaffold|402440|ftp://...\n|PDS000096654.2\n"
kkonganti@17 67 + "Mentioning this option will create a pickle file for the\nprovided metadata and exits.",
kkonganti@17 68 )
kkonganti@17 69 parser.add_argument(
kkonganti@17 70 "-fs",
kkonganti@17 71 dest="force_write_pick",
kkonganti@17 72 action="store_true",
kkonganti@17 73 required=False,
kkonganti@17 74 help="By default, when -s flag is on, the pickle file named *.ACC2SERO.pickle\n"
kkonganti@17 75 + "is written to CWD. If the file exists, the program will not overwrite\n"
kkonganti@17 76 + "and exit. Use -fs option to overwrite.",
kkonganti@17 77 )
kkonganti@17 78 parser.add_argument(
kkonganti@17 79 "-m",
kkonganti@17 80 dest="mash_screen_res",
kkonganti@17 81 default=False,
kkonganti@17 82 required=False,
kkonganti@17 83 help="Absolute UNIX path to `mash screen` results file.",
kkonganti@17 84 )
kkonganti@17 85 parser.add_argument(
kkonganti@17 86 "-ms",
kkonganti@17 87 dest="mash_screen_res_suffix",
kkonganti@17 88 default=".screened",
kkonganti@17 89 required=False,
kkonganti@17 90 help="Suffix of the `mash screen` result file.",
kkonganti@17 91 )
kkonganti@17 92 parser.add_argument(
kkonganti@17 93 "-ps",
kkonganti@17 94 dest="pickled_sero",
kkonganti@17 95 default=False,
kkonganti@17 96 required=False,
kkonganti@17 97 help="Absolute UNIX Path to serialized metadata object in a pickle file.\n"
kkonganti@17 98 + "You can create the pickle file of the metadata using -s option.\n"
kkonganti@17 99 + "Required if -m is on.",
kkonganti@17 100 )
kkonganti@17 101 parser.add_argument(
kkonganti@17 102 "-gd",
kkonganti@17 103 dest="genomes_dir",
kkonganti@17 104 default=False,
kkonganti@17 105 required=False,
kkonganti@17 106 help="Absolute UNIX path to a directory containing\n"
kkonganti@17 107 + "gzipped genome FASTA files.\n"
kkonganti@17 108 + "Required if -m is on.",
kkonganti@17 109 )
kkonganti@17 110 parser.add_argument(
kkonganti@17 111 "-gds",
kkonganti@17 112 dest="genomes_dir_suffix",
kkonganti@17 113 default="_scaffolded_genomic.fna.gz",
kkonganti@17 114 required=False,
kkonganti@17 115 help="Genome FASTA file suffix to search for\nin the directory mentioned using\n-gd.",
kkonganti@17 116 )
kkonganti@17 117 parser.add_argument(
kkonganti@17 118 "-n",
kkonganti@17 119 dest="num_uniq_hits",
kkonganti@17 120 default=10,
kkonganti@17 121 required=False,
kkonganti@17 122 help="This many number of serotype genomes' accessions are returned.",
kkonganti@17 123 )
kkonganti@17 124 parser.add_argument(
kkonganti@17 125 "-skip",
kkonganti@17 126 dest="skip_accs",
kkonganti@17 127 default=str(""),
kkonganti@17 128 required=False,
kkonganti@17 129 help="Skip all hits which belong to the following bioproject accession(s).\n"
kkonganti@17 130 + "A comma separated list of more than one bioproject.",
kkonganti@17 131 )
kkonganti@17 132 parser.add_argument(
kkonganti@17 133 "-op",
kkonganti@17 134 dest="out_prefix",
kkonganti@17 135 default="MASH_SCREEN",
kkonganti@17 136 required=False,
kkonganti@17 137 help="Set the output file prefix for .fna.gz and .txt files.",
kkonganti@17 138 )
kkonganti@17 139 # required = parser.add_argument_group('required arguments')
kkonganti@17 140
kkonganti@17 141 args = parser.parse_args()
kkonganti@17 142 num_uniq_hits = int(args.num_uniq_hits)
kkonganti@17 143 mash_screen_res = args.mash_screen_res
kkonganti@17 144 mash_screen_res_suffix = args.mash_screen_res_suffix
kkonganti@17 145 pickle_sero = args.sero_snp_metadata
kkonganti@17 146 pickled_sero = args.pickled_sero
kkonganti@17 147 f_write_pick = args.force_write_pick
kkonganti@17 148 genomes_dir = args.genomes_dir
kkonganti@17 149 genomes_dir_suffix = args.genomes_dir_suffix
kkonganti@17 150 out_prefix = args.out_prefix
kkonganti@17 151 skip_accs = args.skip_accs
kkonganti@17 152 skip_accs_list = list()
kkonganti@17 153 skip_check = re.compile(r"PRJNA\d+(?:\,PRJNA\d+){0,1}")
kkonganti@17 154 req_metadata = {
kkonganti@17 155 "mlst_sequence_type": "ST",
kkonganti@17 156 "epi_type": "ET",
kkonganti@17 157 "host": "HO",
kkonganti@17 158 "host_disease": "HD",
kkonganti@17 159 "isolation_source": "IS",
kkonganti@17 160 "outbreak": "OU",
kkonganti@17 161 "source_type": "SOT",
kkonganti@17 162 "strain": "GS",
kkonganti@17 163 }
kkonganti@17 164 target_acc_key = "target_acc"
kkonganti@17 165 ncbi_path_heading = "NCBI Pathogen Isolates Browser"
kkonganti@17 166 ncbi_path_uri = "https://www.ncbi.nlm.nih.gov/pathogens/isolates/#"
kkonganti@17 167 mash_genomes_gz = os.path.join(
kkonganti@17 168 os.getcwd(), out_prefix + "_TOP_" + str(num_uniq_hits) + "_UNIQUE_HITS.fna.gz"
kkonganti@17 169 )
kkonganti@17 170 mash_uniq_hits_txt = os.path.join(
kkonganti@17 171 os.getcwd(), re.sub(".fna.gz", ".txt", os.path.basename(mash_genomes_gz))
kkonganti@17 172 )
kkonganti@17 173 mash_uniq_accs_txt = os.path.join(
kkonganti@17 174 os.getcwd(), re.sub(".fna.gz", "_ACCS.txt", os.path.basename(mash_genomes_gz))
kkonganti@17 175 )
kkonganti@17 176 mash_popup_info_txt = os.path.join(
kkonganti@17 177 os.getcwd(), re.sub(".fna.gz", "_POPUP.txt", os.path.basename(mash_genomes_gz))
kkonganti@17 178 )
kkonganti@17 179
kkonganti@17 180 if mash_screen_res and os.path.exists(mash_genomes_gz):
kkonganti@17 181 logging.error(
kkonganti@17 182 "A concatenated genome FASTA file,\n"
kkonganti@17 183 + f"{os.path.basename(mash_genomes_gz)} already exists in:\n"
kkonganti@17 184 + f"{os.getcwd()}\n"
kkonganti@17 185 + "Please remove or move it as we will not "
kkonganti@17 186 + "overwrite it."
kkonganti@17 187 )
kkonganti@17 188 exit(1)
kkonganti@17 189
kkonganti@17 190 if os.path.exists(mash_uniq_hits_txt) and os.path.getsize(mash_uniq_hits_txt) > 0:
kkonganti@17 191 os.remove(mash_uniq_hits_txt)
kkonganti@17 192
kkonganti@17 193 if mash_screen_res and (not genomes_dir or not pickled_sero):
kkonganti@17 194 logging.error("When -m is on, -ps and -gd are also required.")
kkonganti@17 195 exit(1)
kkonganti@17 196
kkonganti@17 197 if skip_accs and not skip_check.match(skip_accs):
kkonganti@17 198 logging.error(
kkonganti@17 199 "Supplied bio project accessions are not valid!\n"
kkonganti@17 200 + "Valid options:\n\t-skip PRJNA766315\n\t-skip PRJNA766315,PRJNA675435"
kkonganti@17 201 )
kkonganti@17 202 exit(1)
kkonganti@17 203 elif skip_check.match(skip_accs):
kkonganti@17 204 datasets_cmd = "datasets summary genome accession --as-json-lines --report ids_only".split()
kkonganti@17 205 datasets_cmd.append(skip_accs)
kkonganti@17 206 dataformat_cmd = "dataformat tsv genome --fields accession --elide-header".split()
kkonganti@17 207 try:
kkonganti@17 208 accs_query = subprocess.run(datasets_cmd, capture_output=True, check=True)
kkonganti@17 209 try:
kkonganti@17 210 skip_accs_list = (
kkonganti@17 211 subprocess.check_output(dataformat_cmd, input=accs_query.stdout)
kkonganti@17 212 .decode("utf-8")
kkonganti@17 213 .split("\n")
kkonganti@17 214 )
kkonganti@17 215 except subprocess.CalledProcessError as e:
kkonganti@17 216 logging.error(f"Query failed\n\t{dataformat_cmd.join(' ')}\nError:\n\t{e}")
kkonganti@17 217 exit(1)
kkonganti@17 218 except subprocess.CalledProcessError as e:
kkonganti@17 219 logging.error(f"Query failed\n\t{datasets_cmd.join(' ')}\nError:\n\t{e}")
kkonganti@17 220 exit(1)
kkonganti@17 221
kkonganti@17 222 if len(skip_accs_list) > 0:
kkonganti@17 223 filter_these_hits = list(filter(bool, skip_accs_list))
kkonganti@17 224 else:
kkonganti@17 225 filter_these_hits = list()
kkonganti@17 226
kkonganti@17 227 if genomes_dir:
kkonganti@17 228 if not os.path.isdir(genomes_dir):
kkonganti@17 229 logging.error("UNIX path\n" + f"{genomes_dir}\n" + "does not exist!")
kkonganti@17 230 exit(1)
kkonganti@17 231 if len(glob.glob(os.path.join(genomes_dir, "*" + genomes_dir_suffix))) <= 0:
kkonganti@17 232 logging.error(
kkonganti@17 233 "Genomes directory"
kkonganti@17 234 + f"{genomes_dir}"
kkonganti@17 235 + "\ndoes not seem to have any\n"
kkonganti@17 236 + f"files ending with suffix: {genomes_dir_suffix}"
kkonganti@17 237 )
kkonganti@17 238 exit(1)
kkonganti@17 239
kkonganti@17 240 if pickle_sero and os.path.exists(pickle_sero) and os.path.getsize(pickle_sero) > 0:
kkonganti@17 241 acc2serotype = defaultdict()
kkonganti@17 242 init_pickled_sero = os.path.join(os.getcwd(), out_prefix + ".ACC2SERO.pickle")
kkonganti@17 243
kkonganti@17 244 if (
kkonganti@17 245 os.path.exists(init_pickled_sero)
kkonganti@17 246 and os.path.getsize(init_pickled_sero)
kkonganti@17 247 and not f_write_pick
kkonganti@17 248 ):
kkonganti@17 249 logging.error(
kkonganti@17 250 f"File {os.path.basename(init_pickled_sero)} already exists in\n{os.getcwd()}\n"
kkonganti@17 251 + "Use -fs to force overwrite it."
kkonganti@17 252 )
kkonganti@17 253 exit(1)
kkonganti@17 254
kkonganti@17 255 with open(pickle_sero, "r") as sero_snp_meta:
kkonganti@17 256 for line in sero_snp_meta:
kkonganti@17 257 cols = line.strip().split("|")
kkonganti@17 258 url_cols = cols[3].split("/")
kkonganti@17 259
kkonganti@17 260 if not 4 <= len(cols) <= 5:
kkonganti@17 261 logging.error(
kkonganti@17 262 f"The metadata file {pickle_sero} is malformed.\n"
kkonganti@17 263 + f"Expected 4-5 columns. Got {len(cols)} columns.\n"
kkonganti@17 264 )
kkonganti@17 265 exit(1)
kkonganti@17 266
kkonganti@17 267 if not len(url_cols) > 5:
kkonganti@17 268 acc = url_cols[3]
kkonganti@17 269 else:
kkonganti@17 270 acc = url_cols[9]
kkonganti@17 271
kkonganti@17 272 if not re.match(r"^GC[AF]\_\d+\.\d+$", acc):
kkonganti@17 273 logging.error(
kkonganti@17 274 f"Did not find accession in either field number 4\n"
kkonganti@17 275 + "or field number 10 of column 4."
kkonganti@17 276 )
kkonganti@17 277 exit(1)
kkonganti@17 278
kkonganti@17 279 acc2serotype[acc] = cols[0]
kkonganti@17 280
kkonganti@17 281 with open(init_pickled_sero, "wb") as write_pickled_sero:
kkonganti@17 282 pickle.dump(file=write_pickled_sero, obj=acc2serotype)
kkonganti@17 283
kkonganti@17 284 logging.info(
kkonganti@17 285 f"Created the pickle file for\n{os.path.basename(pickle_sero)}.\n"
kkonganti@17 286 + "This was the only requested function."
kkonganti@17 287 )
kkonganti@17 288 sero_snp_meta.close()
kkonganti@17 289 write_pickled_sero.close()
kkonganti@17 290 exit(0)
kkonganti@17 291 elif pickle_sero and not (os.path.exists(pickle_sero) and os.path.getsize(pickle_sero) > 0):
kkonganti@17 292 logging.error(
kkonganti@17 293 "Requested to create pickle from metadata, but\n"
kkonganti@17 294 + f"the file, {os.path.basename(pickle_sero)} is empty or\ndoes not exist!"
kkonganti@17 295 )
kkonganti@17 296 exit(1)
kkonganti@17 297
kkonganti@17 298 if mash_screen_res and os.path.exists(mash_screen_res):
kkonganti@17 299 if os.path.getsize(mash_screen_res) > 0:
kkonganti@17 300 seen_uniq_hits = 0
kkonganti@17 301 unpickled_acc2serotype = pickle.load(file=open(pickled_sero, "rb"))
kkonganti@17 302
kkonganti@17 303 with open(mash_screen_res, "r") as msh_res:
kkonganti@17 304 mash_hits = defaultdict()
kkonganti@17 305 seen_mash_sero = defaultdict()
kkonganti@17 306
kkonganti@17 307 for line in msh_res:
kkonganti@17 308 cols = line.strip().split("\t")
kkonganti@17 309
kkonganti@17 310 if len(cols) < 5:
kkonganti@17 311 logging.error(
kkonganti@17 312 f"The file {os.path.basename(mash_screen_res)} seems to\n"
kkonganti@17 313 + "be malformed. It contains less than required 5-6 columns."
kkonganti@17 314 )
kkonganti@17 315 exit(1)
kkonganti@17 316
kkonganti@17 317 mash_hit_acc = re.sub(
kkonganti@17 318 genomes_dir_suffix,
kkonganti@17 319 "",
kkonganti@17 320 str((re.search(r"GC[AF].*?" + genomes_dir_suffix, cols[4])).group()),
kkonganti@17 321 )
kkonganti@17 322
kkonganti@17 323 if mash_hit_acc:
kkonganti@17 324 mash_hits.setdefault(cols[0], []).append(mash_hit_acc)
kkonganti@17 325 else:
kkonganti@17 326 logging.error(
kkonganti@17 327 "Did not find an assembly accession in column\n"
kkonganti@17 328 + f"number 5. Found {cols[4]} instead. Cannot proceed!"
kkonganti@17 329 )
kkonganti@17 330 exit(1)
kkonganti@17 331 msh_res.close()
kkonganti@17 332 elif os.path.getsize(mash_screen_res) == 0:
kkonganti@17 333 failed_sample_name = os.path.basename(mash_screen_res).rstrip(mash_screen_res_suffix)
kkonganti@17 334 with open(
kkonganti@17 335 os.path.join(os.getcwd(), "_".join([out_prefix, "FAILED.txt"])), "w"
kkonganti@17 336 ) as failed_sample_fh:
kkonganti@17 337 failed_sample_fh.write(f"{failed_sample_name}\n")
kkonganti@17 338 failed_sample_fh.close()
kkonganti@17 339 exit(0)
kkonganti@17 340
kkonganti@17 341 # ppp.pprint(mash_hits)
kkonganti@17 342 msh_out_txt = open(mash_uniq_hits_txt, "w")
kkonganti@17 343 wrote_header_pop = False
kkonganti@17 344 wrote_header_acc = False
kkonganti@17 345
kkonganti@17 346 with open(mash_genomes_gz, "wb") as msh_out_gz:
kkonganti@17 347 for _, (ident, acc_list) in enumerate(sorted(mash_hits.items(), reverse=True)):
kkonganti@17 348 for acc in acc_list:
kkonganti@17 349 if len(filter_these_hits) > 0 and acc in filter_these_hits:
kkonganti@17 350 continue
kkonganti@17 351 if seen_uniq_hits >= num_uniq_hits:
kkonganti@17 352 break
kkonganti@17 353 if isinstance(unpickled_acc2serotype[acc], dict):
kkonganti@17 354 if target_acc_key in unpickled_acc2serotype[acc].keys():
kkonganti@17 355 if not wrote_header_pop:
kkonganti@17 356 mash_out_pop_txt = open(mash_popup_info_txt, "w")
kkonganti@17 357 mash_out_pop_txt.write("POPUP_INFO\nSEPARATOR COMMA\nDATA\n")
kkonganti@17 358 wrote_header_pop = True
kkonganti@17 359
kkonganti@17 360 pdt = "".join(unpickled_acc2serotype[acc][target_acc_key])
kkonganti@17 361
kkonganti@17 362 popup_line = ",".join(
kkonganti@17 363 [
kkonganti@17 364 acc,
kkonganti@17 365 ncbi_path_heading,
kkonganti@17 366 f'<a target="_blank" href="{ncbi_path_uri + pdt}">{pdt}</a>',
kkonganti@17 367 ]
kkonganti@17 368 )
kkonganti@17 369 mash_out_pop_txt.write(popup_line + "\n")
kkonganti@17 370
kkonganti@17 371 if all(
kkonganti@17 372 k in unpickled_acc2serotype[acc].keys() for k in req_metadata.keys()
kkonganti@17 373 ):
kkonganti@17 374 if not wrote_header_acc:
kkonganti@17 375 msh_out_accs_txt = open(mash_uniq_accs_txt, "w")
kkonganti@17 376 msh_out_txt.write("METADATA\nSEPARATOR COMMA\nFIELD_LABELS,")
kkonganti@17 377 msh_out_txt.write(
kkonganti@17 378 f"{','.join([str(key).upper() for key in req_metadata.keys()])}\nDATA\n"
kkonganti@17 379 )
kkonganti@17 380 wrote_header_acc = True
kkonganti@17 381
kkonganti@17 382 metadata_line = ",".join(
kkonganti@17 383 [
kkonganti@17 384 re.sub(
kkonganti@17 385 ",",
kkonganti@17 386 "",
kkonganti@17 387 "|".join(unpickled_acc2serotype[acc][m]),
kkonganti@17 388 )
kkonganti@17 389 for m in req_metadata.keys()
kkonganti@17 390 ],
kkonganti@17 391 )
kkonganti@17 392
kkonganti@17 393 msh_out_txt.write(f"{acc.strip()},{metadata_line}\n")
kkonganti@17 394 msh_out_accs_txt.write(
kkonganti@17 395 f"{os.path.join(genomes_dir, acc + genomes_dir_suffix)}\n"
kkonganti@17 396 )
kkonganti@17 397 seen_mash_sero[acc] = 1
kkonganti@17 398 seen_uniq_hits += 1
kkonganti@17 399 elif not isinstance(unpickled_acc2serotype[acc], dict):
kkonganti@17 400 if unpickled_acc2serotype[acc] not in seen_mash_sero.keys():
kkonganti@17 401 seen_mash_sero[unpickled_acc2serotype[acc]] = 1
kkonganti@17 402 seen_uniq_hits += 1
kkonganti@17 403 # print(acc.strip() + '\t' + ident + '\t' + unpickled_acc2serotype[acc], file=sys.stdout)
kkonganti@17 404 msh_out_txt.write(
kkonganti@17 405 f"{acc.strip()}\t{unpickled_acc2serotype[acc]}\t{ident}\n"
kkonganti@17 406 )
kkonganti@17 407 with open(
kkonganti@17 408 os.path.join(genomes_dir, acc + genomes_dir_suffix),
kkonganti@17 409 "rb",
kkonganti@17 410 ) as msh_in_gz:
kkonganti@17 411 msh_out_gz.writelines(msh_in_gz.readlines())
kkonganti@17 412 msh_in_gz.close()
kkonganti@17 413 msh_out_gz.close()
kkonganti@17 414 msh_out_txt.close()
kkonganti@17 415
kkonganti@17 416 if "msh_out_accs_txt" in locals().keys() and not msh_out_accs_txt.closed:
kkonganti@17 417 msh_out_accs_txt.close()
kkonganti@17 418 if "mash_out_pop_txt" in locals().keys() and not mash_out_pop_txt.closed:
kkonganti@17 419 mash_out_pop_txt.close()
kkonganti@17 420
kkonganti@17 421 logging.info(
kkonganti@17 422 f"File {os.path.basename(mash_genomes_gz)}\n"
kkonganti@17 423 + f"written in:\n{os.getcwd()}\nDone! Bye!"
kkonganti@17 424 )
kkonganti@17 425 exit(0)
kkonganti@17 426
kkonganti@17 427
kkonganti@17 428 if __name__ == "__main__":
kkonganti@17 429 main()