test_head.py

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from os.path import join, dirname
import ROOT

ROOT.gSystem.Load("libKM3NeTROOT")

def test_multi_tag():
    h = ROOT.Head()

    h.set_line("seed", "42")
    h.set_line("detector", "aaa bbb")
    h.set_line("detector", "ccc ddd")
    h.set_line("detector", "ccc ddd eee")

    ROOT.write(h, ROOT.std.cout)

    keys = h.matching_keys("detector")
    print("keys = ", keys)

    v = h.get_lines("detector")
    lines = list( v ) # okay, but keep v alive
    print(lines)

    assert lines == ['aaa bbb', 'ccc ddd', 'ccc ddd eee']

test_multi_tag()