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How do you extract a column from a multi-dimensional array?
Does anybody know how to extract a column from a multi-dimensional array in Python?
20 Answers
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Read only the first line of a file?
...d in the docs, unless it is the only line in the file, the string returned from f.readline() will contain a trailing newline. You may wish to use f.readline().strip() instead to remove the newline.
The with statement automatically closes the file again when the block ends.
The with statement only wo...
How to get the second column from command output?
...t the lines on "s:
awk -F '"' '{print $2}' your_input_file
or for input from pipe
<some_command> | awk -F '"' '{print $2}'
output:
A B
C
D
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How to calculate number of days between two given dates?
...e objects, you can just subtract them, which computes a timedelta object.
from datetime import date
d0 = date(2008, 8, 18)
d1 = date(2008, 9, 26)
delta = d1 - d0
print(delta.days)
The relevant section of the docs:
https://docs.python.org/library/datetime.html.
See this answer for another exampl...
jQuery .hasClass() vs .is()
... a preferred method of determining whether an element is assigned a class, from a performance standpoint?
4 Answers
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Android Preferences: How to load the default values when the user hasn't used the preferences-screen
...
this question is similar to mine:
initialize-preferences-from-xml-in-main-activity
Just use this code in onCreate method:
PreferenceManager.setDefaultValues(this, R.xml.preference, false);
It will load your preferences from XML, and last parameter (readAgain) will guarantee that u...
Ansible: Set variable to file content
...p will work with local files, not remote files.
Here's a complete example from the docs:
- hosts: all
vars:
contents: "{{ lookup('file', '/etc/foo.txt') }}"
tasks:
- debug: msg="the value of foo.txt is {{ contents }}"
...
When is an interface with a default method initialized?
...owever, the behavior of Oracle JDK and OpenJDK (javac and HotSpot) differs from what's specified here. In particular, the Example 12.4.1-3 from this section covers interface initialization. The example as follows:
interface I {
int i = 1, ii = Test.out("ii", 2);
}
interface J extends I {
in...
How to iterate through SparseArray?
...keyAt(int index) Given an index in the range 0...size()-1, returns the key from the indexth key-value mapping that this SparseArray stores." so it works fine for me even for the case described by you.
– Ruzanna
Mar 3 '12 at 17:13
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Is there an easy way to check the .NET Framework version?
...
Something like this should do it. Just grab the value from the registry
For .NET 1-4:
Framework is the highest installed version, SP is the service pack for that version.
RegistryKey installed_versions = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setu...