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Perrylili

#1 Created at ... [Delete] [Delete and Lock User]
def trim(s):
    m = 0
    n = len(s)-1
    if s != " ":
        while m < len(s) and s[m] == " ":
	        m = m+1
        while n >= 0 and s[n] == " ":
	        n = n-1
        if m == len(s):
	        s = ""
        else:    
            s = s[m:n+1]
    else:
        s = ""
    return s

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