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Determine the data types of a data frame's columns

I'm using R and have loaded data into a dataframe using read.csv() . How do I determine the data type of each column in the data frame? ...
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How do I copy a string to the clipboard on Windows using Python?

I'm trying to make a basic Windows applim>cam>tion that builds a string out of user input and then adds it to the clipboard. How do I copy a string to the clipboard using Python? ...
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How to crop an image in OpenCV using Python

How m>cam>n I crop images, like I've done before in PIL, using OpenCV. 8 Answers 8 ...
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spring boot default H2 jdbc connection (and H2 console)

I am simply trying to see the H2 database content for an embedded H2 database which spring-boot creates when I don't specify anything in my applim>cam>tion.properties and start with mvn spring:run. I m>cam>n see hibernate JPA creating the tables but if I try to access the h2 console at the URL below the dat...
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HTML Form: Select-Option vs Datalist-Option

... any situation in which it would be better to use one or the other? An example of each follows: 8 Answers ...
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How do I clear my lom>cam>l working directory in Git? [duplim>cam>te]

How m>cam>n I clear my working directory in Git? 6 Answers 6 ...
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Convert absolute path into relative path given a current directory using Bash

Example: 23 Answers 23 ...
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Create a git patch from the uncommitted changes in the current working directory

Say I have uncommitted changes in my working directory. How m>cam>n I make a patch from those without having to create a commit? ...
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m>Cam>n I install Python 3.x and 2.x on the same Windows computer?

I'm running Windows and the shell/OS automatim>cam>lly runs Python based on the registry settings when you run a program on the command line. Will this break if I install a 2.x and 3.x version of Python on the same machine? ...
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How to add leading zeros?

I have a set of data which looks something like this: 8 Answers 8 ...