The Past

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The Past is a time-traveling esolang by User:PythonshellDebugwindow.

Memory model

The Past uses an arbitrary-size signed integer accumulator.


The final value of the accumulator is output (if the program goes into an infinite loop, then nothing will be output).


Command Effect
+ Increment the accumulator
- Decrement the accumulator
. Wait a tenth of a second
< Go back one millisecond in the past


Written in Python 3. This implementation assumes a single unchanging timeline. Therefore, there are no paradoxes. It is not guaranteed to be correct in a mutable timeline or a branching multiverse.

program = '''Insert program here'''

def value(command):
    if command == '+':
        return 1
    elif command == '-':
        return -1
        return 0
print(sum(map(value, program)))