ProcessAndLog object has no attribute 'step'

[mike-perdide]

I get the above AttributeError when running the following example (from doc/manual.rst) :

# Configure: a dot every 10 steps
logger.dot_every(10)

# Configure: progress message every 100 steps
logger.progress_every(100)

# Optional: reset the number of iterations
logger.progress_reset()

while x != 1:

    # count one step
    logger.step()

    if x % 2 == 0:  # if x is odd
        x /= 2  # halve x
    else:
        x = 3 * x + 1

logger.complete()