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import ruamel.yaml
inp = """\
- &CENTER {x: 1, y: 2}
- &LEFT {x: 0, y: 2}
- &BIG {r: 10}
- &SMALL {r: 1}
# All the following maps are equal:
# Explicit keys
- x: 1
y: 2
r: 10
label: center/big
# Merge one map
- <<: *CENTER
r: 10
label: center/big
# Merge multiple maps
- <<: [*CENTER, *BIG]
label: center/big
# Override
- <<: [*BIG, *LEFT, *SMALL]
x: 1
label: center/big
"""
data = ruamel.yaml.load(inp, ruamel.yaml.RoundTripLoader)
assert data[7]['y'] == 2
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