是否可以在Python中的字符串中打印換行符

Question

我有一個字符串，我想要編輯並再次打印，但保留了\ n換行符而不實際上斷行。舉一個例子來說明;我想操作下面的字符串（連續重複3次）並打印出來。當我打印它時，我希望它具有相同的格式（包括\ n's），而不是單獨的行。

"left join recommendation_customer_action rca ON rca.analysis_id=a.analysis_id\nleft join zipcode_electric_region reg ON reg.zipcode = addr.zip\nleft join carbon_conversion_factor ccf ON ccf.energy_type_id = aes.energy_type_id AND ccf.region_id = reg.region_id\nwhere (fs_stages.label = \"First Audit\" AND r.recommendation IS NOT NULL) OR (fs_stages.label = \"First Screen\" AND sppc.savings IS NOT NULL) OR (fs_stages.label = \"Queue\") OR (fs_stages.label = \"Disqualified\")\ngroup by a.analysis_id" 

即我不想：

left join recommendation_customer_action rca ON rca.analysis_id=a.analysis_id 
left join zipcode_electric_region reg ON reg.zipcode = addr.zip 

等等

任何幫助表示讚賞！

Answer 1

可以使用repr內置打印換行符爲\n：

>>> mystr = 'a\nb' 
>>> print mystr 
a 
b 
>>> print repr(mystr) 
'a\nb' 
>>> print repr(mystr)[1:-1] # This will get rid of the apostrophes added by repr 
a\nb 
>>> 

Answer 2

使用repr得到'\n'的是，用str.strip或切片去除''返回由repr：

>>> s = "left join recommendation_customer_action rca ON rca.analysis_id=a.analysis_id\nleft join zipcode_electric_region reg ON reg.zipcode = addr.zip\nleft join carbon_conversion_factor ccf ON ccf.energy_type_id = aes.energy_type_id AND ccf.region_id = reg.region_id\nwhere (fs_stages.label = \"First Audit\" AND r.recommendation IS NOT NULL) OR (fs_stages.label = \"First Screen\" AND sppc.savings IS NOT NULL) OR (fs_stages.label = \"Queue\") OR (fs_stages.label = \"Disqualified\")\ngroup by a.analysis_id" 

切片：

>>> print repr(s)[1:-1] 
left join recommendation_customer_action rca ON rca.analysis_id=a.analysis_id\nleft join zipcode_electric_region reg ON reg.zipcode = addr.zip\nleft join carbon_conversion_factor ccf ON ccf.energy_type_id = aes.energy_type_id AND ccf.region_id = reg.region_id\nwhere (fs_stages.label = "First Audit" AND r.recommendation IS NOT NULL) OR (fs_stages.label = "First Screen" AND sppc.savings IS NOT NULL) OR (fs_stages.label = "Queue") OR (fs_stages.label = "Disqualified")\ngroup by a.analysis_id 

str.strip：

>>> print repr(s).strip("'") 
left join recommendation_customer_action rca ON rca.analysis_id=a.analysis_id\nleft join zipcode_electric_region reg ON reg.zipcode = addr.zip\nleft join carbon_conversion_factor ccf ON ccf.energy_type_id = aes.energy_type_id AND ccf.region_id = reg.region_id\nwhere (fs_stages.label = "First Audit" AND r.recommendation IS NOT NULL) OR (fs_stages.label = "First Screen" AND sppc.savings IS NOT NULL) OR (fs_stages.label = "Queue") OR (fs_stages.label = "Disqualified")\ngroup by a.analysis_id 

---

第二個選擇是使用str.replace和替換'\n'與'\\n'：

>>> print s.replace('\n', '\\n') 
left join recommendation_customer_action rca ON rca.analysis_id=a.analysis_id\nleft join zipcode_electric_region reg ON reg.zipcode = addr.zip\nleft join carbon_conversion_factor ccf ON ccf.energy_type_id = aes.energy_type_id AND ccf.region_id = reg.region_id\nwhere (fs_stages.label = "First Audit" AND r.recommendation IS NOT NULL) OR (fs_stages.label = "First Screen" AND sppc.savings IS NOT NULL) OR (fs_stages.label = "Queue") OR (fs_stages.label = "Disqualified")\ngroup by a.analysis_id