How to use the uproot.open function in uproot

def test_compression_content1(self):
        for name, array in uproot.open("tests/samples/Zmumu-uncompressed.root")["events"].arrays(["Type", "Event", "E1", "px1", "Q1", "M"]).items():
            array = array.tolist()
            assert uproot.open("tests/samples/Zmumu-zlib.root")["events"].array(name).tolist() == array
            assert uproot.open("tests/samples/Zmumu-lzma.root")["events"].array(name).tolist() == array
            assert uproot.open("tests/samples/Zmumu-lz4.root")["events"].array(name).tolist() == array
            assert uproot.open("tests/samples/Zmumu-zstd.root")["events"].array(name).tolist() == array

def test_selection_2_weights_data(config_2, filename):
    selection = filters.build_selection("test_selection_1",
                                        config_2, weights=["EventWeight"])
    infile = uproot.open(filename)["events"]
    mask = selection(infile, is_mc=False)
    assert np.count_nonzero(mask) == 1486

    header = selection.results_header()
    assert len(header) == 2
    assert len(header[0]) == 9

    result = selection.results()

    assert len(result) == 4
    assert result[0][header[0].index("depth")] == 0
    assert result[0][header[0].index("cut")] == "Any"
    assert result[0][header[0].index("passed_incl")] == 1486
    assert result[0][header[0].index("passed_incl") + 1] == 1486

def test_tree_arrays(self):
        file = uproot.open("tests/samples/simple.root")

        tree = file["tree"]
        arrays = tree.arrays()
        assert arrays[b"one"].tolist() == [1, 2, 3, 4]
        assert arrays[b"two"].tolist() == numpy.array([1.1, 2.2, 3.3, 4.4], dtype=numpy.float32).tolist()
        assert arrays[b"three"].tolist() == [b"uno", b"dos", b"tres", b"quatro"]

        # get arrays again
        arrays = tree.arrays()
        assert arrays[b"one"].tolist() == [1, 2, 3, 4]
        assert arrays[b"two"].tolist() == numpy.array([1.1, 2.2, 3.3, 4.4], dtype=numpy.float32).tolist()
        assert arrays[b"three"].tolist() == [b"uno", b"dos", b"tres", b"quatro"]

        # get tree again
        tree = file["tree"]
        arrays = tree.arrays()

def test_compression_identity(self):
        assert uproot.open("tests/samples/Zmumu-zlib.root").compression.algoname == "zlib"
        assert uproot.open("tests/samples/Zmumu-zlib.root").compression.level == 4

        assert uproot.open("tests/samples/Zmumu-lzma.root").compression.algoname == "lzma"
        assert uproot.open("tests/samples/Zmumu-lzma.root").compression.level == 4

        assert uproot.open("tests/samples/Zmumu-lz4.root").compression.algoname == "lz4"
        assert uproot.open("tests/samples/Zmumu-lz4.root").compression.level == 4

        assert uproot.open("tests/samples/Zmumu-zstd.root").compression.algoname == "zstd"
        assert uproot.open("tests/samples/Zmumu-zstd.root").compression.level == 5

        assert uproot.open("tests/samples/Zmumu-uncompressed.root").compression.level == 0

        assert uproot.open("tests/samples/HZZ-zlib.root").compression.algoname == "zlib"
        assert uproot.open("tests/samples/HZZ-zlib.root").compression.level == 4

        assert uproot.open("tests/samples/HZZ-lzma.root").compression.algoname == "lzma"
        assert uproot.open("tests/samples/HZZ-lzma.root").compression.level == 4

        assert uproot.open("tests/samples/HZZ-lz4.root").compression.algoname == "lz4"
        assert uproot.open("tests/samples/HZZ-lz4.root").compression.level == 4

        assert uproot.open("tests/samples/HZZ-zstd.root").compression.algoname == "zstd"
        assert uproot.open("tests/samples/HZZ-zstd.root").compression.level == 5

        assert uproot.open("tests/samples/HZZ-uncompressed.root").compression.level == 0

def test_double32(self):
        t = uproot.open("tests/samples/demo-double32.root")["T"]
        fD64 = t.array("fD64")
        fF32 = t.array("fF32")
        fI32 = t.array("fI32")
        fI30 = t.array("fI30")
        fI28 = t.array("fI28")
        ratio_fF32 = fF32 / fD64
        ratio_fI32 = fI32 / fD64
        ratio_fI30 = fI30 / fD64
        ratio_fI28 = fI28 / fD64
        assert ratio_fF32.min() > 0.9999 and ratio_fF32.max() < 1.0001
        assert ratio_fI32.min() > 0.9999 and ratio_fI32.max() < 1.0001
        assert ratio_fI30.min() > 0.9999 and ratio_fI30.max() < 1.0001
        assert ratio_fI28.min() > 0.9999 and ratio_fI28.max() < 1.0001

def get_tree(file_name, top_particle, particles):
    """Load a RapidSim tree."""
    rapidsim_file = uproot.open(file_name)
    tree = rapidsim_file['DecayTree']
    return {particle: np.stack([1000.0*tree.array('{}_{}_TRUE'.format(particle, coord))
                                for coord in ('PX', 'PY', 'PZ', 'E')])
            for particle in particles}

def test_issue55(self):
        withoffsets = uproot.open(
            "tests/samples/small-dy-withoffsets.root")["tree"]
        nooffsets = uproot.open(
            "tests/samples/small-dy-nooffsets.root")["tree"]
        assert numpy.array_equal(withoffsets.array("nJet"),
                                 nooffsets.array("nJet"))
        assert numpy.array_equal(withoffsets.array("nMuon"),
                                 nooffsets.array("nMuon"))

        def equal(left, right):
            if len(left) != len(right):
                return False
            for x, y in zip(left, right):
                if not numpy.array_equal(x, y):
                    return False
            return True

def test_issue76(self):
        t = uproot.open("tests/samples/issue76.root")["Events"]
        assert list(t.array("rootStrings")[0]) == [b"2", b"4"]
        x, y = t.array("rootStrings")[0]
        assert isinstance(x, uproot.rootio.TString)

def __init__(self, fin, branch='Events', selected_branches=None, \
            exclude_branches=None, identifier=None, label=None, \
            chunk_size=1000, nevts=-1, specs=None, nan=np.nan, histograms=False, \
            redirector='root://cms-xrd-global.cern.ch', verbose=0):
        self.type = self.__class__.__name__
        self.fin = xfile(fin, redirector)
        self.verbose = verbose
        if self.verbose:
            print("Reading {}".format(self.fin))
        self.istream = uproot.open(self.fin)
        self.branches = {}
        self.gen = None
        self.out_branches = []
        self.identifier = identifier if identifier else ['run', 'event', 'luminosityBlock']
        self.tree = self.istream[branch]
        self.nrows = self.tree.numentries
        self.nevts = nevts if nevts != -1 else self.nrows
        self.label = label
        self.idx = -1
        self.chunk_idx = 0
        self.chunk_size = chunk_size if chunk_size < self.nrows else self.nrows
        self.nan = float(nan)
        self.attrs = []
        self.shape = None
        self.cache = {}
        self.hdict = {}

def basket_numentries(self, i):
        b = uproot.open(self._treelvl1._file._path)[self._treelvl1.name][self.name]
        return b.basket_numentries(i)