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Constructing pandas DataFrame from values in variables gives “ValueError: If using all scalar values
...w (represented by the given dictionary) has no index (not even an implicit one). A simple solution is to wrap the dictionary within a list, which does have "natural indexing". One can claim that if only one dictionary is given (without a wrapping list), then assume index=0, but that can lead to ac...
Logging best practices [closed]
...etc) and Verbose logging simply becomes too much.
Rather than having only one switch that turns it all either on or off, it is useful to be able to turn on this information for one section of your system at a time.
This way, you can locate significant problems from the usually logging (all warning...
Is there common street addresses database design for all addresses of the world? [closed]
I am a programmer and to be honest don't know street address structures of the world, just how in my country is structured :) so which is the best and common database design for storing street addresses? It should be so simple to use, fast to query and dynamic to store all street addresses of the w...
What does the caret (^) character mean?
...e tip of the current branch.
Remember that git commits can have more than one parent. HEAD^ is short for HEAD^1, and you can also address HEAD^2 and so on as appropriate.
You can get to parents of any commit, not just HEAD. You can also move back through generations: for example, master~2 means th...
Extract substring in Bash
...ed) and 5 is the length
If the underscores around the digits are the only ones in the input, you can strip off the prefix and suffix (respectively) in two steps:
tmp=${a#*_} # remove prefix ending in "_"
b=${tmp%_*} # remove suffix starting with "_"
If there are other underscores, it's proba...
How do I perform HTML decoding/encoding using Python/Django?
...ust tell the templating engine not to escape your string. To do that, use one of these options in your template:
{{ context_var|safe }}
{% autoescape off %}
{{ context_var }}
{% endautoescape %}
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How do Python functions handle the types of the parameters that you pass in?
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The other answers have done a good job at explaining duck typing and the simple answer by tzot:
Python does not have variables, like other languages where variables have a type and a value; it has names pointing to objects, which know their type...
Submit HTML form on self page
... attribute, or the value of its form owner’s action attribute, if it has one, or else the empty string.
So they both still valid and works:
<form action="">
<form action="FULL_URL_STRING_OF_CURRENT_PAGE">
If you are sure your audience is using html5 browsers, you can even omit the...
RootViewController Switch Transition Animation
...hile replacing an existing viewcontroller as rootviewcontroller with a new one in the appDelegate?
11 Answers
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Why doesn't RecyclerView have onItemClickListener()?
...arily laid out amount of children, they have delegated the onClick to each one of them, or to programmer implementation.
Think of Recyclerview not as a ListView 1:1 replacement but rather as a more flexible component for complex use cases. And as you say, your solution is what google expected of yo...