import pandas as pd
# 创建示例
data = {
"a": ["bar", "bar", "foo", "foo"],
"b": ["one", "two", "one", "two"],
"c": ["z", "y", "x", "w"],
"d": [1.0, 2.0, 3.0, 4.0]
}
df = pd.DataFrame(data=data)
# print(df)
# a b c d
# 0 bar one z 1.0
# 1 bar two y 2.0
# 2 foo one x 3.0
# 3 foo two w 4.0
# set_index 创建索引
indexed1 = df.set_index("c")
# print(indexed1)
# a b d
# c
# z bar one 1.0
# y bar two 2.0
# x foo one 3.0
# w foo two 4.0
indexed2 = df.set_index(["a", "b"])
# print(indexed2)
# c d
# a b
# bar one z 1.0
# two y 2.0
# foo one x 3.0
# two w 4.0
# reset_index 还原索引 变为默认的整型索引
res2 = indexed2.reset_index()
# print(res2)
# a b c d
# 0 bar one z 1.0
# 1 bar two y 2.0
# 2 foo one x 3.0
# 3 foo two w 4.0
最后
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