如果您要问比较字典的工作原理，是这样的：
用伪代码：
def smallest_diff_key(A, B):
"""return the smallest key adiff in A such that adiff not in B or A[adiff] != B[bdiff]"""
diff_keys = [k for k in A if k not in B or A[k] != B[k]]
return min(diff_keys)
def dict_cmp(A, B):
if len(A) != len(B):
return cmp(len(A), len(B))
try:
adiff = smallest_diff_key(A, B)
except ValueError:
# No difference.
return 0
bdiff = smallest_diff_key(B, A)
if adiff != bdiff:
return cmp(adiff, bdiff)
return cmp(A[adiff], b[bdiff])
这是从dictobject.c中的2.6.3实现翻译而来的。
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