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Sample use, programmatically
  import sys

  # create a Trace object, telling it what to ignore, and whether to
  # do tracing or line-counting or both.
  tracer = trace.Trace(ignoredirs=[sys.base_prefix, sys.base_exec_prefix,],
                       trace=0, count=1)
  # run the new command using the given tracer
  tracer.run('main()')
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  r.write_results(show_missing=True, coverdir="/tmp")
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-c, --count           Count the number of times each line is executed
                      and write the counts to <module>.cover for each
                      module executed, in the module's directory.
                      See also `--coverdir', `--file', `--no-report' below.
-l, --listfuncs       Keep track of which functions are executed at least
                      once and write the results to sys.stdout after the
                      program exits.
-T, --trackcalls      Keep track of caller/called pairs and write the
                      results to sys.stdout after the program exits.
-r, --report          Generate a report from a counts file; do not execute
                      any code.  `--file' must specify the results file to
                      read, which must have been created in a previous run
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Modifiers:
-f, --file=<file>     File to accumulate counts over several runs.
-R, --no-report       Do not generate the coverage report files.
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-C, --coverdir=<dir>  Directory where the report files.  The coverage
                      report for <package>.<module> is written to file
                      <dir>/<package>/<module>.cover.
-m, --missing         Annotate executable lines that were not executed
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-s, --summary         Write a brief summary on stdout for each file.
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-g, --timing          Prefix each line with the time since the program started.
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Filters, may be repeated multiple times:
--ignore-module=<mod> Ignore the given module(s) and its submodules
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