Python 用换行符漂亮地打印元组

如何使其打印：

>>> print(("hello\nworld", "hello2"))
('hello\nworld', 'hello2')

我的意思是，它不能将

\n

打印为符号，而是实现此符号并生成新行

Python版本是

3.4

我尝试使用

pprint

，但效果相同：

('hello
world', 'hello2')

写作：

>>> import pprint
>>> pp = pprint.PrettyPrinter(indent=4)
>>> pp.pprint(("hello\nworld"))
'hello\nworld'

将逐字打印：

print("('Hello\nworld', 'hello2')")

如果您只是想在字符串中插入新行，请使用以下命令：

('hello
world', 'hello2')

\n是新行的转义序列，终止当前行并发出下一行开始的信号

---

要将其与现有代码进行比较，应注意“符号”的位置，表示字符串的开头和结尾。

如果不需要括号和逗号，只需使用

*

运算符即可：

print("Line1\nLine2")

如果您想让它打印括号和逗号，同时将

'\n'

转换为换行符，您必须对该行为进行编码，如@Peter所说

>>> t = ("hello\nworld", "hello2")
>>> print(*t)
hello
world hello2

---

没有任何东西可以为您自动执行这种打印。Python容器默认使用

repr

将其内容转换为字符串（即使您在容器上调用

str

，而不是

repr

）。这是为了避免像

[“foo，bar”，“baz”]

（如果没有包括引号，则无法判断列表中是否有两个或三个项目）

但是，您可以对元组进行自己的格式化，并获得所需的输出：

>>> print('(' + ', '.join(t) + ')')
(hello
world, hello2)

如果字符串包含

“

标记，则这将不正确

---

请注意，Python的格式在处理包含引号的字符串时做了一些巧妙的事情。

下面是一个更复杂的示例，它来自一些让我恼火的Ansible输出：

>>> t = ("hello\nworld", "hello2")
>>> print '({})'.format(', '.join("'{}'".format(value) for value in t))
('hello
world', 'hello2')

---

问题是

pprint

会转义换行符，所以我只需取消换行即可。

您可以执行以下操作：

import pprint

f={
    "failed": True,
    "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'dict object' has no attribute 'uid'\n\nThe error appears to have been in '/usr/local/etc/ansible/roles/singleplatform-eng.users/tasks/main.yml': line 7, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Per-user group creation\n  ^ here\n"
    }

def ppdump(data):
    print pprint.pformat(data, indent=4, width=-1).replace('\\n', '\n')

ppdump(f)
{   'failed': True,
    'msg': "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'dict object'
has no attribute 'uid'

The error appears to have been in '/usr/local/etc/ansible/roles/singleplatform-eng.users/tasks/main.yml': line 7, column 3, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:


- name: Per-user group creation
  ^ here
"}

---

参考此

我认为您不能同时打印数据结构和计算数据。您必须自己实现它。没有注意到您在每个字符串周围包含了

”

。如果您需要，请使用@Jeremie的答案。您必须确保按照您希望的方式格式化元组-

“（'1'，'2'））“

将不同于

”（'1'，'2'）”

。您可以通过执行

打印（*t，sep='，'））来获取逗号。

import pprint

f={
    "failed": True,
    "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'dict object' has no attribute 'uid'\n\nThe error appears to have been in '/usr/local/etc/ansible/roles/singleplatform-eng.users/tasks/main.yml': line 7, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Per-user group creation\n  ^ here\n"
    }

def ppdump(data):
    print pprint.pformat(data, indent=4, width=-1).replace('\\n', '\n')

ppdump(f)
{   'failed': True,
    'msg': "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'dict object'
has no attribute 'uid'

The error appears to have been in '/usr/local/etc/ansible/roles/singleplatform-eng.users/tasks/main.yml': line 7, column 3, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:


- name: Per-user group creation
  ^ here
"}

v = [(1,2),(2,3),(4,5)]
for item in v:
    n1,n2 = item
    print(n1,n2)