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TypeError: method() takes 1 positional argument but 2 were given
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In Python, this:
my_object.method("foo")
...is syntactic sugar, which the interpreter translates behind the scenes into:
MyClass.method(my_object, "foo")
...which, as you can see, does indeed have two arguments - it's just that the first...
Is it possible to target older iOS versions when using Xcode 4.2 and iOS 5 SDK?
...2 with iOS 5 SDK package and I immediately noticed that I am unable to use my iPhone 3Gs with iOS 4.2.1 for debugging. I am only able to debug and test on my iphone 4 with iOS 5 installed.
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Python string prints as [u'String']
...the following:
# Functional style.
print map(lambda x: x.encode('ascii'), my_list)
# List comprehension.
print [x.encode('ascii') for x in my_list]
# Interesting if my_list may be a tuple or a string.
print type(my_list)(x.encode('ascii') for x in my_list)
# What do I care about the brackets any...
Text overwrite in visual studio 2010
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thanks bAN, I don't even have an insert on my keyboard so not sure how it happened to me ;) can confirm the click trick works in VS 2012, but it is INS/OVR
– CodeMonkey
Jan 26 '13 at 11:10
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Why doesn't list have safe “get” method like dictionary?
... requires one and can easily be chained with subsequent method calls (e.g. my_list.get(2, '').uppercase()).
– Tyler Crompton
Jul 3 '17 at 18:10
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Change a column type from Date to DateTime during ROR migration
I need to change my column type from date to datetime for an app I am making. I don't care about the data as its still being developed.
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How do you stash an untracked file?
...elf stashes only the changes to the existing file; the new file remains in my working tree, cluttering up my future work. How do I stash this untracked file?
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Git Push ERROR: Repository not found
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So for me, my password had a ` (tick) in it and PhpStorm was removing the character before sending the git push: Lets say for this example my password is _pa``ssword_ Phpstorm would output the following: https://_username_:_password_...
Where can I find my Facebook application id and secret key?
In my Facebook account, where can I find these application IDs, secret key, all?
7 Answers
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How do I check if a variable exists?
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To check the existence of a local variable:
if 'myVar' in locals():
# myVar exists.
To check the existence of a global variable:
if 'myVar' in globals():
# myVar exists.
To check if an object has an attribute:
if hasattr(obj, 'attr_name'):
# obj.attr_name exist...