<jupyter_start><jupyter_text>Dict can be used to describe the flows limits in the systems.<jupyter_code>names, lower, upper = multidict({ 'x': [0, 1], 'y': [1, 2], 'z': [0, 3] })
print(names)
print(lower)
print(upper)<jupyter_output>['x', 'y', 'z']
{'x': 0, 'y': 1, 'z': 0}
{'x': 1, 'y': 2, 'z': 3}<jupyter_text>Tuplelists  This is new !<jupyter_code>l = tuplelist([(1, 2), (1, 3), (2, 3), (2, 4)])
l.select(1, '*')
l.select("*", 3)<jupyter_output><empty_output>
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