sprad a écrit :
I've done a good bit of Perl, but I'm new to Python.
I find myself doing a lot of typecasting (or whatever this thing I'm
about to show you is called),
Actually, it's just plain object instanciation.
and I'm wondering if it's normal, or if
I'm missing an important idiom.
For example:
bet = raw_input("Enter your bet")
if int(bet) == 0:
# respond to a zero bet
raw_input() returns a string. If you want an int and the string is
supposed to contain a legitimate string representation of an integer,
then yes, passing the string to the int object constructor is the right
thing to do. I'd just write it a bit diffently:
bet = int(raw_input("Enter your bet"))
if bet == 0:
# code here
or even better:
def read_int(prompt, err="Sorry, '%s' is not a valid integer"):
while True:
answer = raw_input(prompt)
try:
return int(answer)
except ValueError:
print err % answer
bet = read_int("Enter your bet")
if bet == 0:
# code here
Or later, I'll have an integer, and I end up doing something like
this:
print "You still have $" + str(money) + " remaining"
May suggest learning about string formatting ?
print "You still have $%s remaining" % money
But indeed, you obviously cannot add strings with numerics nor
concatenate numerics with strings. This would make no sense.
All the time, I'm going int(this) and str(that). Am I supposed to?
Depends on the context.
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