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Oracle find a constraint
I have a constraint called users.SYS_C00381400 . How do I find what that constraint is? Is there a way to query all constraints?
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Google breakpad stackwalker无法加载符号 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ython 脚本 gen_symbols.py 自动生成：
#!/usr/bin/python
import sys
import getopt
import os
import errno
from os.path import basename
def make_sure_path_exists(path):
try:
os.makedirs(path)
except OSError as exception:
if exception.errno != errno.EEXIST:...
Is there a difference between “==” and “is”?
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is will return True if two variables point to the same object, == if the objects referred to by the variables are equal.
>>> a = [1, 2, 3]
>>> b = a
>>> b is a
True
>>> b == a
True
# Make a new copy of list `a` via the slice ...
Change column type from string to float in Pandas
I want to convert a table, represented as a list of lists, into a Pandas DataFrame . As an extremely simplified example:
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Number of processors/cores in command line
...X, you can do:
CORES=$(grep -c ^processor /proc/cpuinfo 2>/dev/null || sysctl -n hw.ncpu)
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convert double to int
What is the best way to convert a double to an int ? Should a cast be used?
10 Answers
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In Python, how can you load YAML mappings as OrderedDicts?
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The yaml module allow you to specify custom 'representers' to convert Python objects to text and 'constructors' to reverse the process.
_mapping_tag = yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG
def dict_representer(dumper, data):
return dumper.represent_dict(data.iteritems())
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Bash tool to get nth line from a file
...o be just as fast or faster. At least, it was (significantly) faster on my system when I tried it with NUM being 250000 on a file with half a million lines. YMMV, but I don't really see why it would.
– rici
Mar 25 '14 at 2:43
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Proper indentation for Python multiline strings
...P 257:
def trim(docstring):
if not docstring:
return ''
# Convert tabs to spaces (following the normal Python rules)
# and split into a list of lines:
lines = docstring.expandtabs().splitlines()
# Determine minimum indentation (first line doesn't count):
indent = sys...
How to convert numbers between hexadecimal and decimal
How do you convert between hexadecimal numbers and decimal numbers in C#?
17 Answers
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