Question

Each of the following Python functions is supposed to check whether its argument has any lowercase letters.

For each function, describe what it actually does when called with a string argument. If it does not correctly check for lowercase letters, give an example argument that produces incorrect results, and describe why the result is incorrect.

# 1

def any_lowercase1(s):
for c in s:
if c.islower():
return True
else:
return False

# 2

def any_lowercase2(s):
for c in s:
if 'c'.islower():
return 'True'
else:
return 'False'

# 3

def any_lowercase3(s):
for c in s:
flag = c.islower()
return flag

# 4

def any_lowercase4(s):
flag = False
for c in s:
flag = flag or c.islower()
return flag

# 5

def any_lowercase5(s):
for c in s:
if not c.islower():
return False
return True

Answer 1

Dear Student ,

As per requirement submitted above kindly find below solution.

Function 1:

def any_lowercase1(s):
for c in s:
if c.islower():
return True
else:
return False
#function call
print(any_lowercase1("AAfA"))

Explanation :

• Given function is checking each letter from the string using for loop but it is returning the result after each letter check and returning the result
• for above arguments AAfA will returning the wrong result as False instead it should return True that string AAfA contains lowercase letter.

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Function 2:

def any_lowercase2(s):
for c in s:
if 'c'.islower():
return 'True'
else:
return 'False'
print(any_lowercase2("AsDF"))

Explanation :

• This function given above will always return True because in if c is used is lower case and hence will produce wrong result.

*******************************************************

Function 3:

def any_lowercase3(s):
for c in s:
flag = c.islower()
return flag
print(any_lowercase3("AsDD"))

Explanation :In the function given above for given arguments AsDD function will return the wrong result because flag is returning the value of last letter.

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Function 4:

def any_lowercase4(s):
flag = False
for c in s:
flag = flag or c.islower()
return flag
print(any_lowercase4("ASDf"))

Explanation :

• Function given above will return the correct result for any given arguments if string contains lowercase letter it will return true
• Otherwise false.

**************************************************

Function 5:

def any_lowercase5(s):
for c in s:
if not c.islower():
return False
return True
print(any_lowercase5("asAf"))

Explanation :

• Given function above will return true only when all letters are lowercase otherwise always return False.

NOTE :PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.