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How to check file MIME type with javascript before upload?

I have read this and this questions which seems to suggest that the file MIME type could be checked using javascript on client side. Now, I understand that the real validation still has to be done on server side. I want to perform a client side checking to avoid unnecessary wastage of server res...
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How to make a chain of function decorators?

...dule from PyPI: they preserve certain important metadata (such as __name__ and, speaking about the decorator package, function signature). – Marius Gedminas Mar 11 '11 at 2:30 ...
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Asynchronous Requests with Python requests

...was written. However, you could just replace requests with grequests below and it should work. I've left this answer as is to reflect the original question which was about using requests < v0.13.0. To do multiple tasks with async.map asynchronously you have to: Define a function for what yo...
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Declare and initialize a Dictionary in Typescript

...ke use of the typed dictionary by splitting your example up in declaration and initialization, like: var persons: { [id: string] : IPerson; } = {}; persons["p1"] = { firstName: "F1", lastName: "L1" }; persons["p2"] = { firstName: "F2" }; // will result in an error ...
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Filter by property

...perties, you have to load the object into Python to evaluate the property--and at that point, you've already done all the work to load it. share | improve this answer | follo...
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How do I use grep to search the current directory for all files having the a string “hello” yet disp

How do I use grep to search the current directory for any and all files containing the string "hello" and display only .h and .cc files? ...
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add created_at and updated_at fields to mongoose schemas

Is there a way to add created_at and updated_at fields to a mongoose schema, without having to pass them in everytime new MyModel() is called? ...
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How to check whether a pandas DataFrame is empty?

How to check whether a pandas DataFrame is empty? In my case I want to print some message in terminal if the DataFrame is empty. ...
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How to randomize (or permute) a dataframe rowwise and columnwise?

...,] > df2 a b c 3 0 1 0 4 0 0 0 2 1 0 0 1 1 1 0 By default sample() randomly reorders the elements passed as the first argument. This means that the default size is the size of the passed array. Passing parameter replace=FALSE (the default) to sample(...) ensures that sampling is done withou...
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How to delete a row by reference in data.table?

...estion. data.table can't delete rows by reference yet. data.table can add and delete columns by reference since it over-allocates the vector of column pointers, as you know. The plan is to do something similar for rows and allow fast insert and delete. A row delete would use memmove in C to budge u...