Page 4 - Tips, tricks, inspiration, etc

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#46

January 8th, 2013, 01:52 PM

Erents

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Hi, I am a bit of a newbie and have a simple problem that I cannot solve so I have come here to get some help from the experts.

I am trying to count the number of gpio inputs per second. I have the code to count the number of inputs and I can count a second using time.time etc. I just cannot figure this out the code required to count inputs per second.

Any help would be appreciated!

Thanks,

Martin.

#47

January 30th, 2013, 03:21 PM

Lucantrop

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Hey, Martin, for starters, I'm pretty sure that this is not the right topic for asking questions, but since it's out here, why not answer it anyway - The math behind your problem is pretty simple as in total_inputs/total_time = inputs_per_second.
To get the inputs and time you need to:

Code:

import time

start_time = time.time()
total_inputs = 0

# insert the code for inputs with total_inputs += 1 for every input
# probably best in a while loop

total_time = time.time() - start_time

def gpio_per_sec(inputs, total_time):
    input_per_sec = inputs/time
    print inputs_per_sec # optional

gpio_per_sec(inputs, total_time)

And that should do it.

#48

February 20th, 2013, 01:25 PM

PythonNewb

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Thanks for the tips guys!

#49

March 12th, 2013, 03:17 AM

aleque

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Awesome links. Thanks!

Can someone please recommend me a good Python book? It must cover the most important parts of Python and appeal to a beginner like me. There are lots of books out there and it is hard to chose, so I trust the suggestions on this forum

#50

May 7th, 2013, 06:43 AM

johnmacklen

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There are many tips and tricks you can learn in Python:

There are many tips and tricks you can learn in Python:

Strings:
*Triple quotes are an easy way to define a string with both single and double quotes.
*String concatenation is expensive. Use percent formatting and str.join() for concatenation:

(but don't worry about this unless your resulting string is more than 500-1000 characters long)

Code:

print "Spam" + " eggs" + " and" + " spam"               # DON'T DO THIS
print " ".join(["Spam","eggs","and","spam"])            # Much faster/more
                                                        # common Python idiom
print "%s %s %s %s" % ("Spam", "eggs", "and", "spam")   # Also a pythonic way of
                                                        # doing it - very fast

Module choice:
*cPickle is a faster, C written module for pickle. cPickle is used to serialize python program. Other modules have C implementations as well, cStringIO for the StringIO module, and cProfile for the profile module.

Code:

import cPickle # You may want to import it as P for convenience.

*These can even fall back to the slower pure-python version if they fail to import.

Code:

try:
  import cPickle as pickle
except ImportError:
  import pickle

Some more tips & tricks on next posts...
please keep in touch ...

Thank You...!!!

Page 4 - Tips, tricks, inspiration, etc

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