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How to take the first N items from a generator or list in Python? [duplicate]
...te, it's also very concise to combine zip() with xrange(n) (or range(n) in Python3), which works nice on generators as well and seems to be more flexible for changes in general.
# Option #1: taking the first n elements as a list
[x for _, x in zip(xrange(n), generator)]
# Option #2, using 'next()'...
Create a “with” block on several context managers? [duplicate]
...owing how many mangers are there in the array. will it be possible in some python3.X to do with [cm1,cm2,cm3,cm4,cm5] as result: ....
– olamundo
Jun 11 '10 at 17:50
2
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Replace console output in Python
... expected time of finishing. Super useful and quick. Works for python2 and python3.
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How can I read large text files in Python, line by line, without loading it into memory?
...d using line by line reading and writing. It's CRAZY FAST.
#!/usr/bin/env python3.6
import sys
with open(sys.argv[2], 'w') as outfile:
with open(sys.argv[1]) as infile:
for line in infile:
outfile.write(line)
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Choosing a file in Python with simple Dialog
... @WestAce yes, it was changed from "Tkinter" to "tkinter" for Python3
– Ben
Jul 19 '18 at 0:26
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filename and line number of python script
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Thanks to mcandre, the answer is:
#python3
from inspect import currentframe, getframeinfo
frameinfo = getframeinfo(currentframe())
print(frameinfo.filename, frameinfo.lineno)
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How to validate a url in Python? (Malformed or not)
...nswer:
try:
# python2
from urlparse import urlparse
except:
# python3
from urllib.parse import urlparse
a = 'http://www.cwi.nl:80/%7Eguido/Python.html'
b = '/data/Python.html'
c = 532
d = u'dkakasdkjdjakdjadjfalskdjfalk'
def uri_validator(x):
try:
result = urlparse(x)
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Why do Python's math.ceil() and math.floor() operations return floats instead of integers?
...he result of floor/ceil to be a float instead of an integer. The fact that python3 does return integers shows that this is in fact the more useful thing to do. I don't buy the "the point of..." claim; it seems that you're defining the point based on what it does, rather than what a programmer might ...
Maximum value for long integer
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In python3, you can send the float value into the int function the get that number 1.7976931348623157e+308 in integer representation.
import sys
int(sys.float_info.max)
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How to make lists contain only distinct element in Python? [duplicate]
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i am wrong or with python3k the values will be preserved, cause set now are sorted?
– Ant
Dec 16 '10 at 10:32
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