Virtual environment is essential component of Python world. You can isolate different version of packages into separate environments.
How to set up virtualenv?
Install Python and virtualenv package by pip:
pip install virtualenv
Create directory which will hold the virtual environment (e.g. pyenv34) and initialize it:
virtualenv --system-site-packages pyenv34
You can uses system-site-packages option to tell virtualenv to inherit system packages from system installation of Python.
The next step is to activate environment:
Your command prompt will change and you will see the name of virtual environment in the command line.
Now you can install, uninstall packages by pip and everything will be isolated in the virtual environment directory.
E.g. install ipython
It’s time to import antigravity 🙂
Git has very good command line interface. Git package also contains one handy GUI extension.
You’ll get simple GUI tool for staging commits, viewing diffs and many more.
Windows users can install git package by Chocolatey.
You can find more information about this command at git-scm.com.
Watch our video stream at Vimeo or Youtube.
Shells like Bash or Zsh have one neat feature: repeat last command.
How to invoke it? Use double exclamation mark:
This is very handy when you have typed the command as normal user, but it must be executed by sudo.
apt-get install safeq
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
Execute the same command with elevated privileges:
Sometimes it is necessary to work only with text console.
Git provides rich command line interface, but browsing history is little bit cumbersome.
If you like command line tools and email client mutt then there is awesome tool for you: tig.
tig is text mode interface for git.
Just enter directory with cloned git repo and type:
- Enter – show details
- Tab – switch window pane
- q – quit
You can find more information at http://jonas.nitro.dk/tig/manual.html.
This tool is available for Mac and Linux. Windows version is available in Cygwin.
Multiple cursors feature has been introduced also to IntelliJ Idea in version 13.1.
This feature has been inspired by Sublime Text and it was the top voted feature in Idea.
How it works?
Press Shift+Alt+left click
You can see multiple cursors and they will perform the same operation as you start typing.
You can find more information at blog.jetbrains.com.
Sometimes it is necessary to modify several places in text file at once.
Sublime Text has very neat feature: multiple cursors.
Point mouse cursor at desired text location, press CTRL and left click. You can repeat this operation several times.
You’ll see multiple cursors and as you start typing all cursors will perform the same operation.
Gradle requires Java and it can reuse all great features from the runtime. The drawback is that it takes several seconds to boot whole Groovy/Java engine after typing command: gradle.
There is simple way how to speed up Gradle: use daemon mode.
The easiest approach is to put following line into file ~/.gradle/gradle.properties:
Gradle will automatically spawn daemon process after the first execution of command gradle.
Every build is starting faster.
That’s nice, but daemon is sitting in the memory. You can shut down daemon by command:
Interesting option for developers is to leave daemon in running in foreground and watch daemon in debug mode:
gradle --foreground --debug
More detailed info about Gradle daemon is available in Gradle manual.
InteliJ Idea is very powerful IDE.
There is one keyboard shortcut which gives you full access to Ideas power:
You can type part of command or action into the text field and Idea will search in all available features and actions.
Note: Mac version is Command+Shift+A.