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def evalsum(s):     """Returns a string encoding a sum expression as a value.""" evalsum: This function should accept a string encoding decimal numbers, separated by whitespace and by + and - operators, and should return None if invalid or the sum as a python float. For example, evalsum("1+2.2-3.141592") should return -0.5840800.... An input string-encoded number can be integral or not, can have preceding or trailing zeros or not, and can begin with a period, but cannot end with a period. Hint: try using re.match to match a prefix of the string in a loop, removing that prefix at each iteration.

def evalsum(s):     """Returns a string encoding a sum expression as a value.""" evalsum: This function should accept a string encoding decimal numbers, separated by whitespace and by + and - operators, and should return None if invalid or the sum as a python float. For example, evalsum("1+2.2-3.141592") should return -0.5840800.... An input string-encoded number can be integral or not, can have preceding or trailing zeros or not, and can begin with a period, but cannot end with a period. Hint: try using re.match to match a prefix of the string in a loop, removing that prefix at each iteration.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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def evalsum(s):
    """Returns a string encoding a sum expression as a value."""

evalsum: This function should accept a string encoding decimal numbers, separated by whitespace and by + and - operators, and should return None if invalid or the sum as a python float. For example, evalsum("1+2.2-3.141592") should return -0.5840800.... An input string-encoded number can be integral or not, can have preceding or trailing zeros or not, and can begin with a period, but cannot end with a period. Hint: try using re.match to match a prefix of the string in a loop, removing that prefix at each iteration.

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