Python去除操作

# 使用字符串函数strip()去除字符串两端的空格
string = "  hello world  "
result = string.strip()
print(result)  # 输出: "hello world"

# 使用字符串函数replace()去除字符串中的所有空格
string = "  hello world  "
result = string.replace(" ", "")
print(result)  # 输出: "helloworld"

# 使用正则表达式去除字符串中的所有空格
import re
string = "  hello world  "
result = re.sub(r"\s+", "", string)
print(result)  # 输出: "helloworld"

hello world
helloworld
helloworld

# 使用字符串函数replace()去除字符串中的特定字符
string = "Hello, World!"
result = string.replace(",", "")
print(result)  # 输出: "Hello World!"

# 使用正则表达式去除字符串中的特定字符
import re
string = "Hello, World!"
result = re.sub(r"[, !]", "", string)
print(result)  # 输出: "HelloWorld"

Hello World!
HelloWorld

# 使用set()函数去除列表中的重复元素
my_list = [1, 2, 3, 3, 4, 5, 5]
result = list(set(my_list))
print(result)  # 输出: [1, 2, 3, 4, 5]

# 使用列表推导式去除列表中的重复元素
my_list = [1, 2, 3, 3, 4, 5, 5]
result = [x for i, x in enumerate(my_list) if x not in my_list[:i]]
print(result)  # 输出: [1, 2, 3, 4, 5]

[1, 2, 3, 4, 5]
[1, 2, 3, 4, 5]

# 使用字典推导式去除字典中的空值
my_dict = {"name": "John", "age": None, "gender": "", "city": "New York"}
result = {k: v for k, v in my_dict.items() if v is not None and v != ""}
print(result)  # 输出: {"name": "John", "city": "New York"}

{'name': 'John', 'city': 'New York'}

# 使用filter()函数去除列表中的空元素
my_list = ["apple", "", "banana", "", "cherry"]
result = list(filter(None, my_list))
print(result)  # 输出: ["apple", "banana", "cherry"]

# 使用列表推导式去除列表中的空元素
my_list = ["apple", "", "banana", "", "cherry"]
result = [x for x in my_list if x]
print(result)  # 输出: ["apple", "banana", "cherry"]

['apple', 'banana', 'cherry']
['apple', 'banana', 'cherry']