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How to use string.replace() in python 3.x
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The replace() method in python 3 is used simply by:
a = "This is the island of istanbul"
print (a.replace("is" , "was" , 3))
#3 is the maximum replacement that can be done in the string#
>>> Thwas was the wasland of istanbul
# Last substring 'is' in istanbul i...
virtualenvwrapper and Python 3
... Didn't quite work for me on OSX with 2.7.8 and 3.4.1 installed side-by-side via brew. Modifying it to "mkvirtualenv --python=`which python3` nameOfEnvironment" worked perfectly, though.
– Chris Doggett
Aug 13 '14 at 14:43
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Why is debugging better in an IDE? [closed]
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Alert you when certain exceptions are thrown, even if they are handled by the application.
Conditional breakpointing; stopping the application only in exceptional circumstances to allow you to analyse the stack and variables.
View the thread context in multi-threaded applications, which can be d...
UnicodeEncodeError: 'latin-1' codec can't encode character
...p1252')
'He said \x93Hello\x94'
If you are using your database only as a byte store, you can use cp1252 to encode “ and other characters present in the Windows Western code page. But still other Unicode characters which are not present in cp1252 will cause errors.
You can use encode(..., 'ignor...
Value of type 'T' cannot be converted to
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This feels like a mistake by the compiler designers. If all T can be explcitly cast to object and all object can be explcitly cast to string then there should exist a transitive rule that T can be explicitly cast to string. If you incorrectly perfo...
Rails - Validate Presence Of Association?
... the answer, validates_associated checks if the associated object is valid by running the associated class validations. It does not check for the presence. It's also important to note that a nil association is considered valid.
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Is it correct to use alt tag for an anchor link?
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Such things are best answered by looking at the official specification:
go to the specification: https://www.w3.org/TR/html5/
search for "a element": https://www.w3.org/TR/html5/text-level-semantics.html#the-a-element
check "Content attributes", which l...
Python Write bytes to file
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If you want to write bytes then you should open the file in binary mode.
f = open('/tmp/output', 'wb')
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How to drop unique in MySQL?
...que key (rather than the column name). You find the name of the unique key by
mysql> SHOW CREATE TABLE fuinfo;
here you see the name of the unique key, which could be email_2, for example. So...
mysql> DROP INDEX email_2 ON fuinfo;
mysql> DESCRIBE fuinfo;
This should show that the i...
Java synchronized method lock on object, or method?
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If you declare the method as synchronized (as you're doing by typing public synchronized void addA()) you synchronize on the whole object, so two thread accessing a different variable from this same object would block each other anyway.
If you want to synchronize only on one variab...