Python：使用 pandas 打开 txt 时保持前导零

Question

我有这个 txt 文件：

Tu 11:44:00 119 52913161 DETECTOR STATE 0001
Tu 11:44:00 119 52913161 DETECTOR STATE 1100
Tu 11:44:02 119 52913161 DETECTOR STATE 0000
Tu 11:44:02 119 52913161 DETECTOR STATE 1110
Tu 11:44:04 119 52913161 DETECTOR STATE 0000
Tu 11:44:04 119 52913161 DETECTOR STATE 0011

我使用以下代码在 Python (Jupyter Notebook) 中打开：

import pandas as pd
data= pd.read_csv('EXPORT20171205114501_1.txt', sep=" ", header=None)
data.columns = ["day", "time", "street", "sensor", "type", "state", "bits"]

我得到这个输出：

    day time    street  sensor  type    state   bits
0   Tu  11:44:00    119 52913161    DETECTOR    STATE      1
1   Tu  11:44:00    119 52913161    DETECTOR    STATE   1100
2   Tu  11:44:02    119 52913161    DETECTOR    STATE      0
3   Tu  11:44:02    119 52913161    DETECTOR    STATE   1110
4   Tu  11:44:04    119 52913161    DETECTOR    STATE      0
5   Tu  11:44:04    119 52913161    DETECTOR    STATE     11

如何保留前导零？

我尝试了以下选项：

 data = pd.read_csv('EXPORT20171205114501_1.txt', sep=" ", header=None, dtype={'column': object}) 


 data = pd.read_csv('EXPORT20171205114501_1.txt', sep=" ", header=None).astype(str)


 data = pd.read_csv('EXPORT20171205114501_1.txt', sep=" ", header=None, converters={'ColName': str})

None 以上选项有效。我已经将 pandas 更新到最新版本。有什么想法吗？

Answer 1

按列表使用参数名称作为列名称，然后可以通过 dtype 参数和 dictionary:

定义要解析为 string 的列

names = ["day", "time", "street", "sensor", "type", "state", "bits"]
df = pd.read_csv('EXPORT20171205114501_1.txt', sep="\s+", names=names, dtype={'bits':str})
print (df)
  day      time  street    sensor      type  state  bits
0  Tu  11:44:00     119  52913161  DETECTOR  STATE  0001
1  Tu  11:44:00     119  52913161  DETECTOR  STATE  1100
2  Tu  11:44:02     119  52913161  DETECTOR  STATE  0000
3  Tu  11:44:02     119  52913161  DETECTOR  STATE  1110
4  Tu  11:44:04     119  52913161  DETECTOR  STATE  0000
5  Tu  11:44:04     119  52913161  DETECTOR  STATE  0011

如果需要所有列作为字符串：

names = ["day", "time", "street", "sensor", "type", "state", "bits"]
df = pd.read_csv('EXPORT20171205114501_1.txt', sep="\s+", names=names, dtype=str)
print (df)
  day      time  street    sensor      type  state  bits
0  Tu  11:44:00     119  52913161  DETECTOR  STATE  0001
1  Tu  11:44:00     119  52913161  DETECTOR  STATE  1100
2  Tu  11:44:02     119  52913161  DETECTOR  STATE  0000
3  Tu  11:44:02     119  52913161  DETECTOR  STATE  1110
4  Tu  11:44:04     119  52913161  DETECTOR  STATE  0000
5  Tu  11:44:04     119  52913161  DETECTOR  STATE  0011

Python：使用 pandas 打开 txt 时保持前导零

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