Question

In pyhton 3.7 please

2. Write a function that takes, as an argument, either a 12-digit positive integer n or a string consisting of 12 digits, and calculates the 13th digit (the check digit) for a 13-digit ISBN. Name this function calculateCheckDigit(n).

For example, >>>calculateCheckDigit(452678904653) should return 5.

As an additional example, >>>calculateCheckDigit(546654945486) should return 8.

3. Write a function that takes, as an argument, an eight-bit binary string and does the following, in this order: • Verifies that it consists of only the digits 0 and 1 (if not, return “not a binary string”)

• Verifies that it has length 8 (if not, return “wrong length”)

• It returns the eight-bit binary string that results from flipping bits: 0 becomes 1 and 1 becomes 0 Name this function flipBits(myString).

For example, >>>flipBits(“123”) should return the string “not a binary string”.

As another example, >>>flipBits(“1100”) should return the string “wrong length”.

As a final example, >>>flipBits(“11001010”) should return the string “00110101”

4. Write a function that takes, as an argument, two four-bit binary strings, string1 and string2, and does the following, in this order: • Verifies that both strings consist of only the digits 0 and 1 (if not, return “not binary strings”)

• Verifies that both strings have length 4 (if not, return “wrong length”)

• It returns the result of string1 XOR string2 Name this function xor(string1, string2).

For example, >>>xor(“1”, “abc”) should return the string “not binary strings”.

As another example, >>>xor(“1100”, “1”) should return the string “wrong length”.

As a final example, >>>xor(“1100”, “1010”) should return the string “0110”

Answer 1

3)

CODE

def flipBits(myString):

if len(myString) != 8:

return "Wrong length"

for bit in myString:

if bit != '0' and bit != '1':

return "not a binary string"

flipped = ""

for bit in myString:

if bit == "0":

flipped += "1"

else:

flipped += "0"

return flipped

print(flipBits("123"))

print(flipBits("1100"))

print(flipBits("11001010"))

Wrong length Wrong length 00110101 main.py auto-format 1 def flipBits(myString): 2 if len(myString) != 8: return "Wrong length" for bit in myString: if bit != '0' and bit != '1': return "not a binary string" flipped = " for bit in myString: if bit == "": flipped += "1" else: flipped += "O" return flipped print(flipBits ("123")) print(flipBits ("1100")) print(flipBits("11001010")) 17 18

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