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Installing specific package versions with pip
...Requirement already satisfied: pillow==5.2.0 in /home/ubuntu/anaconda3/lib/python3.6/site-packages (5.2.0)
We can use --no-cache-dir together with -I to overwrite this
~$ pip install --no-cache-dir -I pillow==5.2.0
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Which version of Python do I have installed?
...your interpreter is Python 3, but your scripts are run in Python 2 (need #!python3 as the first line).
– leewz
Jul 13 '14 at 18:53
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Getting user input [duplicate]
... if raw_input exists, assign it to the name input. If not, well, you're in python3). Semicolons are actually supposed to be newlines
– NightShadeQueen
Jul 31 '15 at 4:29
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HTTP requests and JSON parsing in Python
...s a valid point, but some packages might depend on the python-requests (or python3-requests) package, so you will need to install somewhere else than /usr/local to avoid breaking those packages. On the other hand, when portability/compatibility is trivial, in my opinion it's worth it.
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Python add item to the tuple
... can do new = a + b instead of new = a + (b,). AFAICT, works the same in python3 and python2.7.
– ILMostro_7
Jun 15 '18 at 11:42
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How do I check (at runtime) if one class is a subclass of another?
...ple
Here is a more complete example with some assertions:
#!/usr/bin/env python3
class Base:
pass
class Derived(Base):
pass
base = Base()
derived = Derived()
# Basic usage.
assert issubclass(Derived, Base)
assert not issubclass(Base, Derived)
# True for same object.
assert issubclass(...
How to “properly” print a list?
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If you are using Python3:
print('[',end='');print(*L, sep=', ', end='');print(']')
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What's the function like sum() but for multiplication? product()?
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@PatrickMcElhaney It sounds like python3 already got rid of the reduce builtin. I think product missed its chance. ;)
– ojrac
Jul 26 '16 at 14:27
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How to search for a string in text files?
...bject rather than a string as well, eg. s.find(b'blabla'):
#!/usr/bin/env python3
import mmap
with open('example.txt', 'rb', 0) as file, \
mmap.mmap(file.fileno(), 0, access=mmap.ACCESS_READ) as s:
if s.find(b'blabla') != -1:
print('true')
You could also use regular expressions ...
Import error: No module name urllib2
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That worked for me in python3:
import urllib.request
htmlfile = urllib.request.urlopen("http://google.com")
htmltext = htmlfile.read()
print(htmltext)
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