AttributeError: module 'time' has no attribute 'clock' in Python 3.8

From the Python 3.8 doc:

The function time.clock() has been removed, after having been deprecated since Python 3.3: use time.perf_counter() or time.process_time() instead, depending on your requirements, to have well-defined behavior. (Contributed by Matthias Bussonnier in bpo-36895.)

Check if you are using PyCrypto, if yes, uninstall it and install PyCryptodome which is a fork of PyCrypto

PyCrypto is dead as mentioned on project issue page

Since both these libraries can coexist, it could be an issue too

pip3 uninstall PyCryptopip3 install -U PyCryptodome

time.clock() was removed in 3.8 because it had platform-dependent behavior:

• On Unix, this returns the current processor time (in seconds)

• On Windows, this returns wall-clock time (in seconds)

  # I ran this test on my dual-boot system as demonstration:print(time.clock()); time.sleep(10); print(time.clock())# Linux:            # Windows:# 0.0382            # 26.1224# 0.0384            # 36.1566

So which function to pick instead?

• Processor Time: This is how long this specific process spends actively being executed on the CPU. Sleep, waiting for a web request, or time when only other processes are executed will not contribute to this.

  • Use time.process_time()

• Wall-Clock Time: This refers to how much time has passed "on a clock hanging on the wall", i.e. outside real time.

  • Use time.perf_counter()

    • time.time() also measures wall-clock time but can be reset, so you could go back in time
    • time.monotonic() cannot be reset (monotonic = only goes forward) but has lower precision than time.perf_counter()