string format %

formatted_string = "Hello, %s! You are %d years old." % (name, age)

name = "Alice"
age = 30
formatted_string = "Hello, %s! You are %d years old." % (name, age)
print(formatted_string)  # 输出: Hello, Alice! You are 30 years old.

# 错误示例
value = 3.14
print("Value is %d" % value)  # TypeError: %d format: a number is required, not float

# 正确示例
print("Value is %.2f" % value)  # 输出: Value is 3.14

# 错误示例
name = "Bob"
age = 25
print("Name: %s, Age: %d" % (age, name))  # 输出: Name: 25, Age: Bob

# 正确示例
print("Name: %s, Age: %d" % (name, age))  # 输出: Name: Bob, Age: 25

# 错误示例
text = "Line1\nLine2"
print("Text: %s" % text)  # 输出: Text: Line1
                         #        Line2

# 正确示例
print("Text: %s" % repr(text))  # 输出: Text: 'Line1\\nLine2'