Python字体库Font()实现文字大小写转换的方法

The Font() library in Python does not have any built-in methods for converting text to uppercase or lowercase. However, we can use the built-in str methods such as upper() and lower() to achieve this.

Here is an example of how to convert text to uppercase and lowercase using the Font() library:

from tkinter import *
from tkinter.font import Font

root = Tk()
root.title("Text Conversion")
root.geometry("300x200")

def convert_to_uppercase():
    text = entry.get()
    converted_text = text.upper()
    label.config(text=converted_text)

def convert_to_lowercase():
    text = entry.get()
    converted_text = text.lower()
    label.config(text=converted_text)

font = Font(size=12)

label = Label(root, text="Enter text:")
label.config(font=font)
label.pack()

entry = Entry(root, font=font)
entry.pack()

uppercase_button = Button(root, text="Convert to Uppercase", command=convert_to_uppercase)
uppercase_button.config(font=font)
uppercase_button.pack()

lowercase_button = Button(root, text="Convert to Lowercase", command=convert_to_lowercase)
lowercase_button.config(font=font)
lowercase_button.pack()

root.mainloop()

In this example, we create a simple GUI using tkinter library, where the user can input a text in an Entry widget. The entered text can be converted to uppercase or lowercase by clicking the respective buttons.

When the "Convert to Uppercase" button is clicked, the convert_to_uppercase() function is called. It retrieves the entered text using entry.get() and converts it to uppercase using text.upper(). The converted text is then displayed in the Label widget using label.config(text=converted_text).

Similarly, when the "Convert to Lowercase" button is clicked, the convert_to_lowercase() function is called. It retrieves the entered text and converts it to lowercase using text.lower(). The converted text is then displayed in the Label widget.

Note: The example assumes that you have the tkinter library installed in your Python environment.