python,for-loop , Refering to Integer inside String? Python


Refering to Integer inside String? Python

Question:

Tag: python,for-loop

How do you refer to an integer inside a string, using python? I am completely new to coding and I am trying to do this bug collection exercise where the user will input the number of bugs collected each day for a week and be presented the total number of bugs collected at the end of the week.

This is the code i have so far.

totalBugs = 0.0
day = 1

for day in range(7):
    bugsToday = input('How many bugs did you get on day', day,'?')
    totalBugs = totalBugs + bugsToday

print 'You\'ve collected ', totalBugs, ' bugs.'

So i'm trying to get the bugsToday prompt inside the loop to ask the user "How many bugs did you collect on day 1?" "How many bugs did you collect on day 2?" And so forth.

How do I do that?


Answer:

The way I would do it is as follows.

total_bugs = 0 #assuming you can't get half bugs, so we don't need a float

for day in xrange(1, 8): #you don't need to declare day outside of the loop, it's declarable in the  for loop itself, though can't be refernced outside the loop.
    bugs_today = int(raw_input("How many  bugs did you collect on day %d" % day)) #two things here, stick to raw_input for security reasons, and also read up on string formatting, which is what I think answers your question. that's the whole %d nonsense. 
    total_bugs += bugs_today #this is shorthand notation for total_bugs = total_bugs + bugs_today.

print total_bugs

To read up on string formatting: http://www.learnpython.org/en/String_Formatting

Article I wrote about raw_input vs. input for security purposes if you're interested in that: https:[email protected]/python-exploitation-1-input-ac10d3f4491f

From the Python Docs:

CPython implementation detail: If s and t are both strings, some Python implementations such as CPython can usually perform an in-place optimization for assignments of the form s = s + t or s += t. When applicable, this optimization makes quadratic run-time much less likely. This optimization is both version and implementation dependent. For performance sensitive code, it is preferable to use the str.join() method which assures consistent linear concatenation performance across versions and implementations.

Programming can seem overwhelming at first, just stick to it you won't regret it. Good luck my friend!


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