Joining Lines and Literals
PyCharm makes it possible to concatenate two unselected or several selected lines into one, removing the extra spaces, and providing the proper syntax. This operation smartly analyzes the lines being joined and treats them accordingly. For example, you can join lines of code, lines of comments, field declaration and initialization.
Place the caret on the line, to which the other lines should be added.
Sequentially press Ctrl+Shift+J keyboard shortcut, until all fragments are joined in a single line.
Joining string literals
Select the lines with string literals that should be joined.
Press Ctrl+Shift+J keyboard shortcut. All redundant characters (spaces, quotes, and plus signs) are gone.
Joining a list of parameters:
Joining commented lines: