Difference between revisions of "Programming performance/hay.steve Python"
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m (Just some layout tweaks.) |
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− | * '''Implementation time''': |
+ | * '''Implementation time''': 1.5 hours. |
* '''Experience''': 3 days. |
* '''Experience''': 3 days. |
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+ | * '''Comments''': I spent most of my time noodling on the syntax of Python and familiarizing myself with the documentation. I also spent some time getting the heap to work instead of taking multiple passes with that data. I originally said it took 2 hours, but I am bringing it down to 1.5 because I was eating dinner while and watching a movie while coding. Also, I came back later and spent a few minutes adding a verbosity feature as suggested in the problem statement. |
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=== Code === |
=== Code === |
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Line 7: | Line 8: | ||
from heapq import heappush, heappop, nsmallest |
from heapq import heappush, heappop, nsmallest |
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+ | verbose=False |
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− | print "Implementation time: 2 hours. Python experience: 3 days." |
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− | |||
filename = "gspc.txt" |
filename = "gspc.txt" |
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Line 19: | Line 19: | ||
heappush( days, linelist ) |
heappush( days, linelist ) |
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− | cash = 10000 |
+ | cash = 10000.00 |
− | |||
previousClose = -1.0 |
previousClose = -1.0 |
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⚫ | |||
− | |||
⚫ | |||
shares = [] |
shares = [] |
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Line 41: | Line 39: | ||
heappush( shares, (currentClose, numShares) ) |
heappush( shares, (currentClose, numShares) ) |
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cash = 0.9 * cash |
cash = 0.9 * cash |
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− | print "On", i, ", bought" , numShares , "shares at" , currentClose , "." |
+ | if verbose: print "On", i, ", bought" , numShares , "shares at" , currentClose , "." |
else : |
else : |
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Line 47: | Line 45: | ||
sell = heappop( shares ) |
sell = heappop( shares ) |
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cash += sell[1] * currentClose |
cash += sell[1] * currentClose |
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− | print "On", i, "sold" , sell[1] , "shares at" , currentClose , "." |
+ | if verbose: print "On", i, "sold" , sell[1] , "shares at" , currentClose , "." |
previousClose = currentClose |
previousClose = currentClose |
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Line 54: | Line 52: | ||
sell = heappop( shares ) |
sell = heappop( shares ) |
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cash += sell[1] * currentClose |
cash += sell[1] * currentClose |
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− | print "Sold" , sell[1] , "shares at" , currentClose , "." |
+ | if verbose: print "Sold" , sell[1] , "shares at" , currentClose , "." |
print "Beginning balance:", beginningBalance |
print "Beginning balance:", beginningBalance |
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− | |||
print "Ending balance:", cash |
print "Ending balance:", cash |
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− | |||
print "Percent Gain:", (cash-beginningBalance)/beginningBalance*100, "%." |
print "Percent Gain:", (cash-beginningBalance)/beginningBalance*100, "%." |
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</code-python> |
</code-python> |
Revision as of 03:46, 8 March 2007
- Implementation time: 1.5 hours.
- Experience: 3 days.
- Comments: I spent most of my time noodling on the syntax of Python and familiarizing myself with the documentation. I also spent some time getting the heap to work instead of taking multiple passes with that data. I originally said it took 2 hours, but I am bringing it down to 1.5 because I was eating dinner while and watching a movie while coding. Also, I came back later and spent a few minutes adding a verbosity feature as suggested in the problem statement.
Code
<code-python> from heapq import heappush, heappop, nsmallest
verbose=False filename = "gspc.txt"
days = []
for f in open(filename):
if f[0] == '#': continue linelist = f.split(' ') heappush( days, linelist )
cash = 10000.00 previousClose = -1.0 currentClose = 0.00
shares = []
beginningBalance = cash
print "Beginning Balance:", cash while days != []:
day = heappop( days ) i = day[0] currentClose = float( day[4] )
if previousClose != -1.0: percentGain = ( currentClose - previousClose ) / previousClose if percentGain < -0.03: numShares = 0.1 * cash / currentClose heappush( shares, (currentClose, numShares) ) cash = 0.9 * cash if verbose: print "On", i, ", bought" , numShares , "shares at" , currentClose , "."
else : while shares != [] and nsmallest(1, shares)[0][0] <= currentClose / 1.06: sell = heappop( shares ) cash += sell[1] * currentClose if verbose: print "On", i, "sold" , sell[1] , "shares at" , currentClose , "."
previousClose = currentClose
while shares != []:
sell = heappop( shares ) cash += sell[1] * currentClose if verbose: print "Sold" , sell[1] , "shares at" , currentClose , "."
print "Beginning balance:", beginningBalance print "Ending balance:", cash print "Percent Gain:", (cash-beginningBalance)/beginningBalance*100, "%." </code-python>
--Hay.steve 01:53, 8 March 2007 (UTC)