ic02 : Review (tracing functions)

num	ready?	description	assigned	due
ic02	true	Review (tracing functions)	Tue 09/11 09:30AM	Tue 09/11 10:50AM

One of the Python functions you were asked to write for one of the labs is the function hasNoX which was supposed to return True if the input were a string that does not contain x or X, and False in every other case (e.g. if the input was not of type str.

For each of the following, there is an attempt at writing hasNoX, many of which contain bugs. Your job is to do what Python would do, i.e. indicate the output of the function call shown. Assume that it has been loaded into idle3 and that we’ve selected Run Module (or pressed F5.)
Then we typed in the function call shown, and something is printed as a result.

Which of the answers shown matches what is printed? Put a check mark (✔) in the appropriate column.

The first is done for you as an illustration

Function Call	`True`	`False`	`None`	Python error message	something else
`hasNoX_2("Fox")`	✔
`hasNoX_2("Xie")`
`hasNoX_2("Axe")`
`hasNoX_2("Pat")`
`hasNoX_2(12345)`

def hasNoX_2(s):
    if type(s)!=str:
       return False
    for c in s:
        if c!='x' or c!='X':
           return True
    return False

Same instructions as previous problem. Hint: pay attention to the indentation.

Function Call	`True`	`False`	`None`	Python error message	something else
`hasNoX_3("Fox")`
`hasNoX_3("Xie")`
`hasNoX_3("Axe")`
`hasNoX_3("Pat")`
`hasNoX_3(12345)`

def hasNoX_3(s):
    if type(s)!=str:
       return False
    for c in s:
        if c=='x' or c=='X':
           return False
        return True

Same instructions as previous problems.

Function Call	`True`	`False`	`None`	Python error message	something else
`hasNoX_4("Fox")`
`hasNoX_4("Xie")`
`hasNoX_4("Axe")`
`hasNoX_4("Pat")`
`hasNoX_4(12345)`

def hasNoX_4(s):
    if type(s)!=str:
       return False
    for c in s:
        if c!='x' and c!='X':
           return True
        else:
           return False

Same instructions as previous problems. Hint:read the first three lines of the function definition carefully, and compare with the others you've already done.

Function Call	`True`	`False`	`None`	Python error message	something else
`hasNoX_5("Fox")`
`hasNoX_5("Xie")`
`hasNoX_5("Axe")`
`hasNoX_5("Pat")`
`hasNoX_5(12345)`

def hasNoX_5(s):
    if s!=str:
       return False
    for c in s:
        if c=='x' or c=='X':
           return False
    return True

Same instructions as previous problems.

Function Call	`True`	`False`	`None`	Python error message	something else
`hasNoX_6("Fox")`
`hasNoX_6("Xie")`
`hasNoX_6("Axe")`
`hasNoX_6("Pat")`
`hasNoX_6(12345)`

def hasNoX_6(s):
    if type(s)!=str:
       return False
    for c in s:
        if c=='x' or c=='X':
           return True
    return False