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CSC Exam 2 – Martin questions with complete solutions
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CSC Exam 2 – Martin questions with complete solutions
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CSC Exam 2 – Martin questions withcomplete solutions
Data Structure - correct answer ✔✔a compound unit that consists of several smaller pieces of data
"len" function - correct answer ✔✔Returns the number of characters it contains. It starts at zero on the
left then goes up by one to the right
>>> len("Hi there!")
9
>>> len("")
0
Immutable data structure - correct answer ✔✔it's internal data elements, the characters, can be
accessed, but the structure itself cannot be modified.
For loop - correct answer ✔✔can access any of the characters in a string.
treats an input file as a sequence of lines. on each pass through the loop, the loop's variable is bound to
a line of text read from the file.
>>> f= open("myfile.txt." ,'r')
>>> for line in f:
print(line)
First line.
Second line.
, Subscript operator - correct answer ✔✔Function that looks like '[]' . inspects each character at a given
position without visiting them all. The positions range from 0 to the length of the string minus 1. Also
used to add a new key/value pair to a dictionary or to replace a value associated with an existing key.
>>> name = 'Alan Turing'
>>> name[0] # Examine the first character
'A'
>>> name[3] # Examine the fourth character
'n'
>>> name[len(name)] # Oops! An index error!
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IndexError: string index out of range
>>> name[len(name) - 1 # Examine the last character
'g'
>>> name[-1] # Shorthand for the last one
'g'
slicing - correct answer ✔✔using a python subscript operator to obtain a sub-string
>>> name='myfile.txt'
>>>name[0:] # the entire string
'myfile.txt'
>>> name[0:1] # the first character
'm'
>>> name[0:2] # The first two characters
'my'
>>> name[:len(name)] # The entire string
'myfile.txt'
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