Python新手入门之单引号、双引号与三引号的差异与应用示例

# 使用单引号定义字符串
single_quoted_string = 'Hello, World!'
print(single_quoted_string)  # 输出：Hello, World!

# 使用双引号定义字符串
double_quoted_string = "Hello, World!"
print(double_quoted_string)  # 输出：Hello, World!

# 使用三引号定义多行字符串
multi_line_string = '''This is a multi-line string.
It spans multiple lines and can contain special characters like quotes ("") without the need for escaping.
'''
print(multi_line_string)

def add_numbers(a, b):
    """
    This function adds two numbers together.
    
    :param a: First number
    :param b: Second number
    :return: Sum of the two numbers
    """
    return a + b

# 访问函数的文档字符串
print(help(add_numbers))

# 访问函数的__doc__属性
print(add_numbers.__doc__)

# 拼接单引号字符串
first_name = 'John'
last_name = 'Doe'
full_name = first_name + ' ' + last_name
print(full_name)  # 输出：John Doe

print("*"*50)

# 拼接双引号字符串
greeting = "Hello"
message = greeting + ", " + full_name + "!"
print(message)  # 输出：Hello, John Doe!

print("*"*50)

# 拼接两个三引号字符串
first_paragraph = '''这是第一段文字。  
它包含多行，并且使用三引号定义。'''

second_paragraph = '''这是第二段文字。  
它同样是多行的，并使用三引号定义。'''

# 使用加号操作符拼接这两个字符串
combined_text = first_paragraph + '\n\n' + second_paragraph

# 打印拼接后的字符串
print(combined_text)