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How do I find out if first character of a string is a number?
...he condition does not appear in a tight loop in your program, the small performance hit for using regular expressions is not likely to be noticeable.
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How to specify the default error page in web.xml?
...ch HTTP errors the enduser could possibly face. On a barebones webapp with for example the usage of HTTP authentication, having a disabled directory listing, using custom servlets and code which can possibly throw unhandled exceptions or does not have all methods implemented, then you'd like to set ...
Python try…except comma vs 'as' in except
...ble.
In Python 2.6+, use the as syntax, since it is far less ambiguous and forward compatible with Python 3.x.
In Python 2.5 and earlier, use the comma version, since as isn't supported.
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Asynchronous shell commands
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Everyone just forgot disown. So here is a summary:
& puts the job in the background.
Makes it block on attempting to read input, and
Makes the shell not wait for its completion.
disown removes the process from the shell's job cont...
How do I provide JVM arguments to VisualVM?
...assume that is the correct option names. You could probably google how to format visualvm.conf for more info...
– Zack Macomber
Feb 18 '13 at 18:50
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How do I use FileSystemObject in VBA?
... Is there a way to AUTO tick the check-box 'Microsoft Scripting Runtime'? for ALL Excel files? I'm using Excel 2016
– compski
Apr 5 '17 at 6:49
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How to convert comma-delimited string to list in Python?
...hem to int individually you can do:
mList = [int(e) if e.isdigit() else e for e in mStr.split(',')]
It is called list comprehension, and it is based on set builder notation.
ex:
>>> mStr = "1,A,B,3,4"
>>> mList = [int(e) if e.isdigit() else e for e in mStr.split(',')]
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Comparing boxed Long values 127 and 128
...127? If the data type of above variable is primitive (long) then code work for all values.
Java caches Integer objects instances from the range -128 to 127. That said:
If you set to N Long variables the value 127 (cached), the same object instance will be pointed by all references. (N variables,...
Prompt for user input in PowerShell
I want to prompt the user for a series of inputs, including a password and a filename.
4 Answers
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Copy multiple files in Python
...-directories copied).
import os
import shutil
src_files = os.listdir(src)
for file_name in src_files:
full_file_name = os.path.join(src, file_name)
if os.path.isfile(full_file_name):
shutil.copy(full_file_name, dest)
...