This set of Python Multiple Choice Questions & Answers (MCQs) focuses on “Regular Expressions – 2”.
1. What will be the output of the following Python code?
re.compile('hello', re.X)
a) [‘h’, ‘e’, ‘l’, ‘l’, ‘o’]
b) re.compile(‘hello’, re.VERBOSE)
c) Error
d) Junk value
View Answer
Explanation: The compile function compiles a pattern of regular expression into an object of regular expression. Re.X is a flag which is also used as re.VERBOSE. Hence the output of this code is: re.compile(‘hello’, re.VERBOSE).
2. What will be the output of the following Python code?
re.split('[a-c]', '0a3B6', re.I)
a) Error
b) [‘a’, ‘B’]
c) [‘0’, ‘3B6’]
d) [‘a’]
View Answer
Explanation: The function re.split() splits the string on the basis of the pattern given in the parenthesis. Since we have used the flag e.I (that is, re.IGNORECASE), the output is: [‘0’, ‘3B6’].
3. What will be the output of the following Python code?
re.sub('morning', 'evening', 'good morning')
a) ‘good evening’
b) ‘good’
c) ‘morning’
d) ‘evening’
View Answer
Explanation: The code shown above first searches for the pattern ‘morning’ in the string ‘good morning’ and then replaces this pattern with ‘evening’. Hence the output of this code is: ‘good evening’.
4. The function re.error raises an exception if a particular string contains no match for the given pattern.
a) True
b) False
View Answer
Explanation: The function re.error raises an exception when a string passed to one of its functions here is not a valid regular expression. It does not raise an exception if a particular string does not contain a match for the given pattern.
5. What will be the output of the following Python code?
re.escape('new**world')
a) ‘new world’
b) ‘new\\*\\*world’
c) ‘**’
d) ‘new’, ‘*’, ‘*’, ‘world’
View Answer
Explanation: The function re.escape escapes all the characters in the pattern other than ASCII letters and numbers. Hence the output of the code shown above is: ‘new\\*\\*world’.
6. What will be the output of the following Python code?
re.fullmatch('hello', 'hello world')
a) No output
b) []
c) <_sre.SRE_Match object; span=(0, 5), match='hello'>
d) Error
View Answer
Explanation: The function re.fullmatch applies the pattern to the entire string and returns an object if match is found and none if match in not found. In the code shown above, match is not found. Hence there is no output.
7. Choose the option wherein the two choices do not refer to the same option.
a)
re.I re.IGNORECASE
b)
re.M re.MULTILINE
c)
re.X re.VERBOSE
d)
re.L re.LOWERCASEView Answer
Explanation: The function re.L is also written as re.LOCALE. There is no function such as re.LOWERCASE in the re module of Python.
8. The difference between the functions re.sub and re.subn is that re.sub returns a _______________ whereas re.subn returns a __________________
a) string, list
b) list, tuple
c) string, tuple
d) tuple, list
View Answer
Explanation: The difference the functions re.sub and re.subn is that re.sub returns a string whereas re.subn returns a tuple.
9. What will be the output of the following Python code?
re.split('mum', 'mumbai*', 1)
a) Error
b) [”, ‘bai*’]
c) [”, ‘bai’]
d) [‘bai*’]
View Answer
Explanation: The code shown above splits the string based on the pattern given as an argument. Hence the output of the code is: [”, ‘bai*’].
10. What will be the output of the following Python code?
re.findall('good', 'good is good') re.findall('good', 'bad is good')
a)
[‘good’, ‘good’] [‘good’]
b)
(‘good’, ‘good’) (good)
c)
(‘good’) (‘good’)
d)
[‘good’] [‘good’]View Answer
Explanation: The function findall returns a list of all the non overlapping matches in a string. Hence the output of the first function is: [‘good’, ‘good’] and that of the second function is: [‘good’].
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