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What is INSTALL_PARSE_FAILED_NO_CERTIFICATES error?
...in/startup (whatever you call it) activity by editing the androidmanifest.xml file. All i did was change the android:name property. however, this completely broke the entire app. when I try to install it fails and reads.
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Center a button in a Linear layout
...er what I try to do the button will top align centre. I have included the XML below, can some one point me in the right direction?
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How to fix Python indentation
I have some Python code that have inconsistent indentation. There is a lot of mixture of tabs and spaces to make the matter even worse, and even space indentation is not preserved.
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How to strip all whitespace from string
How do I strip all the spaces in a python string? For example, I want a string like strip my spaces to be turned into stripmyspaces , but I cannot seem to accomplish that with strip() :
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How can I avoid Java code in JSP files, using JSP 2?
...e displayed which you can anyway customize by an <error-page> in web.xml.
If you want to invoke some Java code to postprocess a request, e.g. processing a form submit, then implement a servlet and write code accordingly in doPost() method. E.g.:
protected void doPost(HttpServletRequest requ...
Why can't Python parse this JSON data?
...hen you should have {}:
[] are for JSON arrays, which are called list in Python
{} are for JSON objects, which are called dict in Python
Here's how your JSON file should look:
{
"maps": [
{
"id": "blabla",
"iscategorical": "0"
},
{
...
What's the u prefix in a Python string?
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You're right, see 3.1.3. Unicode Strings.
It's been the syntax since Python 2.0.
Python 3 made them redundant, as the default string type is Unicode. Versions 3.0 through 3.2 removed them, but they were re-added in 3.3+ for compatibility with Python 2 to aide the 2 to 3 transition.
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What does “hashable” mean in Python?
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From the Python glossary:
An object is hashable if it has a hash value which never changes during its lifetime (it needs a __hash__() method), and can be compared to other objects (it needs an __eq__() or __cmp__() method). Hashab...
Python List vs. Array - when to use?
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Basically, Python lists are very flexible and can hold completely heterogeneous, arbitrary data, and they can be appended to very efficiently, in amortized constant time. If you need to shrink and grow your list time-efficiently and wi...
What does %s mean in a python format string?
What does %s mean in Python? And what does the following bit of code do?
7 Answers
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