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Display help message with python argparse when script is called without any arguments
...print_help()
sys.exit(2)
parser = MyParser()
parser.add_argument('foo', nargs='+')
args = parser.parse_args()
Note that the above solution will print the help message whenever the error
method is triggered. For example, test.py --blah will print the help message
too if --blah isn't a va...
URLs: Dash vs. Underscore [closed]
...ow 6 years old and possibly not representing the contemporary status quo), foo_bar is treated as a single word while foo-bar is treated as two words - precisely the opposite of what this answer speculates is the case.
– Mark Amery
Dec 19 '17 at 21:49
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How to rsync only a specific list of files?
...e source dir. For example, take this command:
rsync -a --files-from=/tmp/foo /usr remote:/backup
If /tmp/foo contains the string "bin" (or even "/bin"), the /usr/bin directory will be created as /backup/bin on the remote host. If it contains "bin/" (note the trailing slash), the immedi...
Checking if sys.argv[x] is defined
...hree arguments) and it can potentially hide errors (eg, if you used blah = foo(sys.argv[1]), but foo(...) raised an IndexError, that IndexError would be ignored).
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XSD - how to allow elements in any order any number of times?
...Fixed type in XML.
Edit: Capitalised O in maxOccurs
<xs:element name="foo">
<xs:complexType>
<xs:choice maxOccurs="unbounded">
<xs:element name="child1" type="xs:int" maxOccurs="unbounded"/>
<xs:element name="child2" type="xs:string" maxOccurs="unbo...
Template function inside template class
...
template <class T>
template <class U>
void MyClass<T>::foo() { /* ... */ }
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Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
...situations are quite handled- for example, if you try to select from table foo while another transaction is dropping it and creating a replacement table foo, then the blocked transaction will finally receive an error rather than finding the new foo table. (Edit: this was fixed in or before PostgreSQ...
Regular expression to match a word or its prefix
...Start phpsh, put some content into a variable, match on word.
el@apollo:~/foo$ phpsh
php> $content1 = 'badger'
php> $content2 = '1234'
php> $content3 = '$%^&'
php> echo preg_match('(\w+)', $content1);
1
php> echo preg_match('(\w+)', $content2);
1
php> echo preg_match('(\w+...
Sorting list based on values from another list?
...ere looking to sort a list by a list where the values matched.
list_a = ['foo', 'bar', 'baz']
list_b = ['baz', 'bar', 'foo']
sorted(list_b, key=lambda x: list_a.index(x))
# ['foo', 'bar', 'baz']
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Check whether a path is valid in Python without creating a file at the path's target
...s, which frankly bore and anger me in equal measure:
>>> print('"foo.bar" valid? ' + str(is_pathname_valid('foo.bar')))
"foo.bar" valid? True
>>> print('Null byte valid? ' + str(is_pathname_valid('\x00')))
Null byte valid? False
>>> print('Long path valid? ' + str(is_path...