{"id":102913,"date":"2022-01-08T15:37:07","date_gmt":"2022-01-08T13:37:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/%d0%b2-3-6-%d0%bf%d1%80%d0%be%d1%82%d0%b5%d1%81%d1%82%d0%b8%d1%80%d0%be%d0%b2%d0%b0%d0%bd%d0%bd%d1%8b%d1%85-python-%d1%80%d0%b5%d0%bf%d0%be%d0%b7%d0%b8%d1%82%d0%be%d1%80%d0%b8%d0%b5%d0%b2-%d0%b2%d1%8b"},"modified":"2022-01-08T15:37:07","modified_gmt":"2022-01-08T13:37:08","slug":"%d0%b2-3-6-%d0%bf%d1%80%d0%be%d1%82%d0%b5%d1%81%d1%82%d0%b8%d1%80%d0%be%d0%b2%d0%b0%d0%bd%d0%bd%d1%8b%d1%85-python-%d1%80%d0%b5%d0%bf%d0%be%d0%b7%d0%b8%d1%82%d0%be%d1%80%d0%b8%d0%b5%d0%b2-%d0%b2%d1%8b","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/%d0%b2-3-6-%d0%bf%d1%80%d0%be%d1%82%d0%b5%d1%81%d1%82%d0%b8%d1%80%d0%be%d0%b2%d0%b0%d0%bd%d0%bd%d1%8b%d1%85-python-%d1%80%d0%b5%d0%bf%d0%be%d0%b7%d0%b8%d1%82%d0%be%d1%80%d0%b8%d0%b5%d0%b2-%d0%b2%d1%8b","title":{"rendered":"3.6% of the tested Python repositories showed errors related to missing commas","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
The results of a study on Python code susceptibility to errors associated with incorrect comma usage in code have been published. The issues arise because Python automatically concatenates strings in a list if they are not separated by a comma, and also treats a value as a tuple if it is followed by a comma. By conducting an automated analysis of 666 GitHub repositories with Python code, researchers identified potential comma issues in 5% of the studied projects. <\/p>\n
Further manual checks revealed that real errors are present in only 24 repositories (3.6%), while the remaining 1.4% are false positives (for instance, a comma might have been intentionally omitted between lines to merge file paths split across multiple lines, long hashes, HTML blocks, or SQL statements). Notably, among the 24 repositories with real errors are major projects such as Tensorflow, Google V8, Sentry, Pydata xarray, rapidpro, django-colorfield, and django-helpdesk. Additionally, comma issues are not specific to Python and often arise in C\/C++ projects (recent examples include fixes in LLVM, Mono, Tensorflow). <\/p>\n
The main types of errors studied include: <\/p>\n
\n
An accidentally omitted comma in lists, tuples, and sets can lead to string concatenation instead of interpreting them as separate values. For example, in Sentry, a comma was missing between 'releases' and 'discover' in a list during one of the tests, resulting in a check for a non-existent handler '\/releasesdiscover' instead of separate checks for '\/releases' and '\/discover'.
<\/center>\n
Another example \u2014 a missing comma in rapidpro caused two different rules to be combined in line 572:
<\/center> <\/p>\n
A missing comma at the end of a one-element tuple definition leads to the assignment of a regular type instead of a tuple. For instance, the expression 'values = (1,)' will assign a one-element tuple to the variable, while 'values = (1)' will lead to the assignment of an integer type. The parentheses in the given assignments do not affect type definition and are optional, as the parser only recognizes a tuple based on the presence of commas. REST_FRAMEWORK = { 'DEFAULT_PERMISSION_CLASSES': ( 'rest_framework.permissions.IsAuthenticated' # a string will be assigned instead of a tuple. ) }\n
The reverse situation \u2014 extra commas during assignment. If a comma is accidentally left at the end of an assignment, a tuple will be assigned instead of a regular type (for example, if 'value = 1' is written as 'value = 1,'). <\/ul>\n
![\"3.6%](\"\/wp-content\/uploads\/2022\/01\/67b17b458cc6743b316dc67db72ed336.jpg\")
<\/center>\n![\"3.6%](\"\/wp-content\/uploads\/2022\/01\/c2a9d6dbdde6965091b27217626ea6c9.jpg\")
<\/center> <\/p>\n