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Python: Appending to a list in a dictionary
x1    y1    z1
x1    y2    z2
x2    y3    z3

data_str = """x1    y1    z1
              x1    y2    z2
              x2    y3    z3"""

data_list = [d.split() for d in data_str.splitlines()] # [['x1', 'y1', 'z1'], ['x1', 'y2', 'z2'], ['x2', 'y3', 'z3']]

from collections import defaultdict
data_dict = defaultdict(list)
for data_row in data_list: # E.g., data_row = ['x1', 'y1', 'z1']
   data_dict[data_row[0]].append(data_row[1:])
print data_dict # defaultdict(<type 'list'>, {'x2': [['y3', 'z3']], 'x1': [['y1', 'z1'], ['y2', 'z2']]})

def makeKeyValuePair(tokens):
    return tokens[0], tokens[1:]

print dict(makeKeyValuePair(line.rstrip().split()) for line in fileObject)

from collections import defaultdict
d = defaultdict(list)

for line in fileObject:
    tokens = line.rstrip().split()
    d[tokens[0]].append(tokens[1:])

d={}
for line in file:
    split = line.strip().split(" ")
    if not d.has_key(split[0]): d[split[0]] = []
    d[split[0]].append(split[1:])

result = { }
for line in lines:
    terms = line.split()
    result.setdefault(terms[0], []).append(terms[1:])