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What is the best way to tell if a character is a letter or number in Java without using regexes?

What is the best and/or easiest way to recognize if a string.charAt(index) is an A-z letter or a number in Java without using regular expressions? Thanks. ...
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ValueError: numpy.dtype has the wrong size, try recompiling

I just installed pandas and statsmodels package on my python 2.7 When I tried "import pandas as pd", this error message comes out. Can anyone help? Thanks!!! ...
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How to use FormData for AJAX file upload?

This is my HTML which I'm generating dynamically using drag and drop functionality. 9 Answers ...
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How do I convert a string to a double in Python?

I would like to know how to convert a string containing digits to a double. 3 Answers ...
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How to round the minute of a datetime object

I have a datetime object produced using strptime() . 17 Answers 17 ...
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Insert text into textarea with jQuery

I'm wondering how I can insert text into a text area using jquery, upon the click of an anchor tag. 17 Answers ...
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How do I change the formatting of numbers on an axis with ggplot?

I'm using R and ggplot to draw a scatterplot of some data, all is fine except that the numbers on the y-axis are coming out with computer style exponent formatting, i.e. 4e+05, 5e+05, etc. This is obviously unacceptable, so I want to get it to display them as 500,000, 400,000, and so on. Getting a p...
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Can I use `pip` instead of `easy_install` for `python setup.py install` dependency resolution?

python setup.py install will automatically install packages listed in requires=[] using easy_install . How do I get it to use pip instead? ...
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iterating over each character of a String in ruby 1.8.6 (each_char)

I am new to ruby and currently trying to operate on each character separately from a base String in ruby. I am using ruby 1.8.6 and would like to do something like: ...
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Why is require_once so bad to use?

Everything I read about better PHP coding practices keeps saying don't use require_once because of speed. 14 Answers ...