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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def histogram(test):
    """Given a string representing a space separated lowercase letters, return a dictionary of the letter with the most repetition and containing the corresponding count. If several letters have the same occurrence, return all of them. histogram('') == {} """
    dict1={}
    list1=test.split(" ")
    t=0

    for i in list1:
        if(list1.count(i)>t) and i!='':
            t=list1.count(i)
    if t>0:
        for i in list1:
            if(list1.count(i)==t):
                
                dict1[i]=t
    return dict1
