Lua 5.4 table implementation in Python

Bring Lua's table to the Python world.

Goals

1. Identical behavior
2. As performance as possible
3. No external dependency

Features

from luatable import Table, pairs, ipairs

t = Table(1, 2, 3, 4, foo="bar", bar="baz")
t[1000] = Table(hello="world")
t.addTwo = lambda x: x + 2

print(t[1])             # 1
print(t.foo)            # bar
print(t["bar"])         # baz
print(t[1000]["hello"]) # world
print(t.addTwo(1))      # 3
print(t["what"])        # None
print(len(t))           # 4

# integer keys are equivalent to their float counterpart
print(t[1] is t[1.0])   # True

# index by `None` is forbidden
print(t[None])          # None
t[None] = 1             # ValueError: table index is nil

for k, v in ipairs(t):
    print(k, v)         # 1 1
                        # 2 2
                        # 3 3
                        # 4 4

for k, v in pairs(t):
    print(k, v)         # order is not guaranteed, but should look like this:
                        # 1 1
                        # 2 2
                        # 3 3
                        # 4 4
                        # foo bar
                        # bar baz
                        # 1000 table: 0x7fee1d99e260
                        # addTwo <function <lambda> at 0x7fee1d9a39a0

Roadmaps

• Table manipulation in the Lua Standard Library: luatable.table
  • table.concat
  • table.insert
  • table.pack
  • table.remove
  • table.sort
  • table.unpack
• Support metatables
• Figure out behavior when indexing table with slice