# Python GUI Programming with Tkinter

Tkinter is the standard GUI library for Python. Python when combined with Tkinter provides a fast and easy way to create GUI applications.

## Importing the Module

```python
import tkinter as tk
```

## Creating a Basic Window

To create a GUI application, you start by creating the main window.

```python
import tkinter as tk

root = tk.Tk()
root.title("My First GUI")
root.geometry("300x200")

root.mainloop()
```

## Widgets

Widgets are the building blocks of a GUI application.

### Label

```python
label = tk.Label(root, text="Hello, Tkinter!")
label.pack()
```

### Button

```python
def on_click():
    print("Button clicked!")

button = tk.Button(root, text="Click Me", command=on_click)
button.pack()
```

### Entry

```python
entry = tk.Entry(root)
entry.pack()
```

## Layout Managers

Tkinter provides three main layout managers to arrange widgets: `pack()`, `grid()`, and `place()`.

### `pack()`

Organizes widgets in blocks before placing them in the parent widget.

```python
label.pack(side=tk.TOP)
button.pack(side=tk.BOTTOM)
```

### `grid()`

Organizes widgets in a table-like structure.

```python
label.grid(row=0, column=0)
button.grid(row=1, column=1)
```

## Event Handling

You can bind functions to events (like button clicks) using the `command` parameter or the `bind()` method.

```python
def greet():
    print("Hello!")

btn = tk.Button(root, text="Greet", command=greet)
btn.pack()
```

[[programming/python/python]]