如何检测'\n'；是否存在于python列表中？

我有一份由一些项目组成的清单。其中一项是\n。我想使用if条件检查列表末尾是否包含“\n.”，但它不起作用

content=['abc'，'def'，'ghi'，'jkl'，'\n.]
如果内容[-1]==（“\n.”或“\\n.”）
打印（'它有效'）
其他：
打印（'它不'）

使用以下方法：

content=['abc'，'def'，'ghi'，'jkl'，'\n.]
如果内容中有“\n.”或内容中有“\\n.”：打印（'It works'）
else:print（'它不'）

您可以使用以下代码。此代码可以识别列表中的

\n.

和

\\n.

，并且可以检查它们是否是列表中的最后一个元素

代码：

content = ["abc", "def", "ghi", "jkl", "\n."]
if "\n." in content:
    print(r"\n in list")
    if "\n." == content[-1]:
        print(r"\n is the last element in list")
    else:
        print(r"\n is not the last element in list")
elif "\\n." in content:
    print(r"\\n in list")
    if "\\n." == content[-1]:
        print(r"\\n is the last element in list")
    else:
        print(r"\\n is not the last element in list")
else:
    print(r"\n or \\n are not in list")

>>> python3 test.py
\n in list
\n is the last element in list

>>> python3 test.py
\n in list
\n is not the last element in list

>>> python3 test.py
\\n in list
\\n is the last element in list

>>> python3 test.py
\\n in list
\\n is not the last element in list

>>> python3 test.py
\n or \\n are not in list

输出：

content = ["abc", "def", "ghi", "jkl", "\n."]
if "\n." in content:
    print(r"\n in list")
    if "\n." == content[-1]:
        print(r"\n is the last element in list")
    else:
        print(r"\n is not the last element in list")
elif "\\n." in content:
    print(r"\\n in list")
    if "\\n." == content[-1]:
        print(r"\\n is the last element in list")
    else:
        print(r"\\n is not the last element in list")
else:
    print(r"\n or \\n are not in list")

>>> python3 test.py
\n in list
\n is the last element in list

>>> python3 test.py
\n in list
\n is not the last element in list

>>> python3 test.py
\\n in list
\\n is the last element in list

>>> python3 test.py
\\n in list
\\n is not the last element in list

>>> python3 test.py
\n or \\n are not in list

---

如果您的

内容
列表为：

content = ["abc", "def", "ghi", "jkl", "\n.", "asdf"]

content = ["abc", "def", "ghi", "jkl", "\\n."]

content = ["abc", "def", "ghi", "jkl", "\\n.", "asdf"]

content = ["abc", "def", "ghi", "jkl", "asdf"]

输出：

content = ["abc", "def", "ghi", "jkl", "\n."]
if "\n." in content:
    print(r"\n in list")
    if "\n." == content[-1]:
        print(r"\n is the last element in list")
    else:
        print(r"\n is not the last element in list")
elif "\\n." in content:
    print(r"\\n in list")
    if "\\n." == content[-1]:
        print(r"\\n is the last element in list")
    else:
        print(r"\\n is not the last element in list")
else:
    print(r"\n or \\n are not in list")

>>> python3 test.py
\n in list
\n is the last element in list

>>> python3 test.py
\n in list
\n is not the last element in list

>>> python3 test.py
\\n in list
\\n is the last element in list

>>> python3 test.py
\\n in list
\\n is not the last element in list

>>> python3 test.py
\n or \\n are not in list


如果您的
内容
列表为：

content = ["abc", "def", "ghi", "jkl", "\n.", "asdf"]

content = ["abc", "def", "ghi", "jkl", "\\n."]

content = ["abc", "def", "ghi", "jkl", "\\n.", "asdf"]

content = ["abc", "def", "ghi", "jkl", "asdf"]

Otuput:

content = ["abc", "def", "ghi", "jkl", "\n."]
if "\n." in content:
    print(r"\n in list")
    if "\n." == content[-1]:
        print(r"\n is the last element in list")
    else:
        print(r"\n is not the last element in list")
elif "\\n." in content:
    print(r"\\n in list")
    if "\\n." == content[-1]:
        print(r"\\n is the last element in list")
    else:
        print(r"\\n is not the last element in list")
else:
    print(r"\n or \\n are not in list")

>>> python3 test.py
\n in list
\n is the last element in list

>>> python3 test.py
\n in list
\n is not the last element in list

>>> python3 test.py
\\n in list
\\n is the last element in list

>>> python3 test.py
\\n in list
\\n is not the last element in list

>>> python3 test.py
\n or \\n are not in list


如果您的
内容
列表为：

content = ["abc", "def", "ghi", "jkl", "\n.", "asdf"]

content = ["abc", "def", "ghi", "jkl", "\\n."]

content = ["abc", "def", "ghi", "jkl", "\\n.", "asdf"]

content = ["abc", "def", "ghi", "jkl", "asdf"]

Otuput:

content = ["abc", "def", "ghi", "jkl", "\n."]
if "\n." in content:
    print(r"\n in list")
    if "\n." == content[-1]:
        print(r"\n is the last element in list")
    else:
        print(r"\n is not the last element in list")
elif "\\n." in content:
    print(r"\\n in list")
    if "\\n." == content[-1]:
        print(r"\\n is the last element in list")
    else:
        print(r"\\n is not the last element in list")
else:
    print(r"\n or \\n are not in list")

>>> python3 test.py
\n in list
\n is the last element in list

>>> python3 test.py
\n in list
\n is not the last element in list

>>> python3 test.py
\\n in list
\\n is the last element in list

>>> python3 test.py
\\n in list
\\n is not the last element in list

>>> python3 test.py
\n or \\n are not in list


如果您的
内容
列表为：

content = ["abc", "def", "ghi", "jkl", "\n.", "asdf"]

content = ["abc", "def", "ghi", "jkl", "\\n."]

content = ["abc", "def", "ghi", "jkl", "\\n.", "asdf"]

content = ["abc", "def", "ghi", "jkl", "asdf"]

Otuput:

content = ["abc", "def", "ghi", "jkl", "\n."]
if "\n." in content:
    print(r"\n in list")
    if "\n." == content[-1]:
        print(r"\n is the last element in list")
    else:
        print(r"\n is not the last element in list")
elif "\\n." in content:
    print(r"\\n in list")
    if "\\n." == content[-1]:
        print(r"\\n is the last element in list")
    else:
        print(r"\\n is not the last element in list")
else:
    print(r"\n or \\n are not in list")

>>> python3 test.py
\n in list
\n is the last element in list

>>> python3 test.py
\n in list
\n is not the last element in list

>>> python3 test.py
\\n in list
\\n is the last element in list

>>> python3 test.py
\\n in list
\\n is not the last element in list

>>> python3 test.py
\n or \\n are not in list

如果内容[-1]='\n.'或内容[-1]='\\n'