dis

import dis
dis.dis('a = [1, 2, 3, 4]')
"""
0 LOAD_CONST               0 (1)
2 LOAD_CONST               1 (2)
4 LOAD_CONST               2 (3)
6 LOAD_CONST               3 (4)
8 BUILD_LIST               4
10 STORE_NAME               0 (a)
12 LOAD_CONST               4 (None)
14 RETURN_VALUE
"""

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dis(Disassembler for Python bytecode)

dis — Disassembler for Python bytecode — Python 3.7.4rc2 documentation