PyCharm Code Editing

As a professional Python IDE, PyCharm provides powerful code editing features.

This chapter will detail the core features of code editing, including smart completion, shortcut operations, code refactoring, and other efficient development techniques.

Basic Editing Features

Code Completion

PyCharm provides multiple smart completion methods:

Enterim + Tab→ Auto-completes toimport:

Enterfor + Tab→ Generate completeforloop structure:

Syntax Highlighting

PyCharm automatically colors code elements:

• Keywords（def, class): blue

• Strings: green

• Comments: gray

• Error syntax: red wavy underline

Custom Highlighting：

1. 设置 → 编辑器 → 配色方案（Color Scheme）

2. Adjust the colors of Python syntax elements

Code Folding

Move the mouse to the left of the code area in the editor to see a downward arrow; clicking it can also collapse:

Code structures that support folding：

• Functions/Methods

• Class definitions

• Multi-line comments

• Import statement groups

Shortcuts and Efficient Operations

Common Shortcuts Quick Reference

Multi-line Editing and Batch Operations

Column Selection Mode

1. HoldAlt(Win) or⌥(Mac) + mouse drag

2. or useAlt + Shift + Insertto toggle column mode

Application scenarios：

# 批量修改多个变量前缀
old_name = 1    →  new_name = 1
old_value = 2   →  new_value = 2

Multi-cursor editing

• HoldAlt+ mouse click (add multiple cursors)

• orCtrl + G（Win）/ ⌘ + G(Mac) select the same word

Code Formatting and Refactoring

Auto-format Code

1. Format current file：

   • Ctrl + Alt + L（Win/Linux）

   • ⌥ + ⌘ + L（Mac）

2. Format selected code：

   • Select code → Right-click →Reformat Code

Configure formatting rules：
设置 → 编辑器 → 代码样式 → Python

Rename Variables/Functions (Safe Refactoring)

1. Select identifier (variable/function name)

2. Right-click → Refactor → Rename

3. or shortcutShift + F6

4. Enter new name → PressEnter

Effect：

• All places referencing this identifier are updated synchronously

• Supports cross-file renaming

Extract Method

Extract the selected code snippet as a new method:

1. Select code block

2. Ctrl + Alt + M（Win）/ ⌘ + ⌥ + M（Mac）

3. Enter method name → Confirm

Inline

Inline the method/variable at the call site:

1. Place the cursor on the method name/variable

2. Ctrl + Alt + N（Win）/ ⌘ + ⌥ + N（Mac）

# 内联前
def calculate_discount(price):
    return price * 0.9

total = calculate_discount(100)  # ← 光标在此行

# 内联后
total = 100 * 0.9  # ← 方法调用被替换为实际代码

Advanced Editing Techniques

Live Templates

Quickly generate common code patterns:

1. Enter abbreviation (e.g.iter) → PressTab

2. Preset templates:

   • main→ Generateif __name__ == '__main__'

   • try→ Generate complete try-except block

Custom templates：
Settings → Editor → Live Templates

Entering iter in the code editor will display template information:

Code Intention Actions (Alt+Enter)

Quickly fix or optimize code based on context:

• Automatically import missing packages

• Convert string formats (f-string / format)

• Optimize conditional expressions

Operation: Place the cursor at the warning/suggestion →Alt + Enter

Summary: Efficient Editing Workflow

1. Writing phase：

   • Use code completion (Ctrl + Space) for quick input

   • Use dynamic templates to generate repetitive structures

2. Optimization phase：

   • Format code (Ctrl + Alt + L)

   • useAlt + EnterQuickly fix issues

3. Refactoring phase：

   • Extract method (Ctrl + Alt + M)

   • Safe rename (Shift + F6)