Python Coding Questions & Answers on “Strings”.
1. What is “Hello”.replace(“l”, “e”)?
a) Heeeo
b) Heelo
c) Heleo
d) None
Answer: a
Clarification: Execute in shell to verify.
2. To retrieve the character at index 3 from string s=”Hello” what command do we execute (multiple answers allowed)?
a) s[]
b) s.getitem(3)
c) s.__getitem__(3)
d) s.getItem(3)
Answer: c
Clarification: __getitem(..) can be used to get character at index specified as parameter.
3. To return the length of string s what command do we execute?
a) s.__len__()
b) len(s)
c) size(s)
d) s.size()
Answer: a
Clarification: Execute in shell to verify.
4. If a class defines the __str__(self) method, for an object obj for the class, you can use which command to invoke the __str__ method.
a) obj.__str__()
b) str(obj)
c) print obj
d) all of the mentioned
Answer: d
Clarification: Execute in shell to verify.
5. To check whether string s1 contains another string s2, use ________
a) s1.__contains__(s2)
b) s2 in s1
c) s1.contains(s2)
d) si.in(s2)
Answer: a
Clarification: s2 in s1 works in the same way as calling the special function __contains__ .
6. Suppose i is 5 and j is 4, i + j is same as ________
a) i.__add(j)
b) i.__add__(j)
c) i.__Add(j)
d) i.__ADD(j)
Answer: b
Clarification: Execute in shell to verify.
7. What will be the output of the following Python code?
-
class Count:
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def __init__(self, count = 0):
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self.__count = count -
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c1 = Count(2)
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c2 = Count(2)
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print(id(c1) == id(c2), end = " ")
-
-
s1 = "Good"
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s2 = "Good"
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print(id(s1) == id(s2))
a) True False
b) True True
c) False True
d) False False
Answer: c
Clarification: Execute in the shell objects cannot have same id, however in the case of strings its different.
8. What will be the output of the following Python code?
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class Name:
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def __init__(self, firstName, mi, lastName):
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self.firstName = firstName
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self.mi = mi
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self.lastName = lastName
-
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firstName = "John"
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name = Name(firstName, 'F', "Smith")
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firstName = "Peter"
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name.lastName = "Pan"
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print(name.firstName, name.lastName)
a) Peter Pan
b) John Pan
c) Peter Smith
d) John Smith
Answer: b
Clarification: Execute in the shell to verify.
9. What function do you use to read a string?
a) input(“Enter a string”)
b) eval(input(“Enter a string”))
c) enter(“Enter a string”)
d) eval(enter(“Enter a string”))
Answer: a
Clarification: Execute in shell to verify.
10. Suppose x is 345.3546, what is format(x, “10.3f”) (_ indicates space).
a) __345.355
b) ___345.355
c) ____345.355
d) _____345.354
Answer: b
Clarification: Execute in the shell to verify.
coding questions on Python,