It is usual to check for an item in a list, tuple, or dict using 'in' operator.
List=[ 'l' , 'i' , 's' , 't']if 's' in List: print "success"
for string we usually go with 'find' function. Its quite easier to go with 'in' operator for string too.
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Educating yourself does not mean that you were stupid in the first place; it means that you are intelligent enough to know that there is plenty left to 'learn'. -Melanie Joy
Sunday, 23 December 2012
Saturday, 22 December 2012
Fancy Formatting using Python
Its quite easy in python to pretty print the output...
Here are two ways to write a table of squares and cubes:
for x in range(1, 6):
... print repr(x).rjust(2), repr(x*x).rjust(3),repr(x*x*x).rjust(4)
...
1 1 1
2 4 8
3 9 27
4 16 64
5 25 125
>>> for x in range(1,6):
......
Some Optimization Tips/Tricks in Python
Looping:
Use xrange for looping across long ranges; it uses much less memory than range, and may save time as well. Both versions are likely to be faster than a while loop:
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Friday, 21 December 2012
Best way to open files in Python
C like syntax is as follows,
f = open("file", 'r')
line = f.readline( )
print line
close(f)
some one may forget to close f. this leads to leak, which is considerable in large scale programs. in order to avoid that we can make use of 'with' or 'for' keywords.
with open("file", 'r') as f:
line = f.readline()
print line
or
for...