Python 3.3+threadingfunction

threading.get_ident()

thread introspection

An integer identifier of the current thread inside Python — a key for a per-thread dictionary; the same as Thread.ident.

Syntax

threading.get_ident()

The number means nothing by itself and is not the OS thread number shown by top or a debugger — get_native_id() gives that one. Once a thread ends its identifier may be reused by a new one, so data keyed by get_ident() that outlives its thread passes to a stranger. threading.local() is usually easier than a dictionary keyed by ident.

Examples

import threading
main = threading.get_ident()
print(main)  # → ? 140213411428160
print(main == threading.main_thread().ident)  # → True
ids = []
t = threading.Thread(target=lambda: ids.append(threading.get_ident()))
t.start()
t.join()
print(ids[0] == t.ident, ids[0] != main)  # → True True

See also

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