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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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f...
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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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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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 ...
搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...est/replset/data
#进入mongodb文件夹
cd /data/mongodbtest
3、下载mongodb的安装程序包
wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.4.8.tgz
注意linux生产环境不能安装32位的mongodb，因为32位受限于操作系统最大2G的文件限制。
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How to check whether a variable is a class or not?
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Doesn't work for me. Using python3 with snakemake, type(snakemake.utils) returns <class 'module'> and yet inspect.isclass(snakemake.utils) returns False.
– tedtoal
Jul 3 '18 at 16:09
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How can I get list of values from dict?
...t.
Therefore list(dictionary.values()) is the one way.
Yet, considering Python3, what is quicker?
[*L] vs. [].extend(L) vs. list(L)
small_ds = {x: str(x+42) for x in range(10)}
small_df = {x: float(x+42) for x in range(10)}
print('Small Dict(str)')
%timeit [*small_ds.values()]
%timeit [].exten...