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[英]Increment a value of column in pandas/csv file when the row is appended in python
[英]How to increment a value of column in pandas/csv file when the row is appended in python
我有這段代碼,它從 csv 文件中選擇一列並將其作為一行附加到另一個 csv 文件:
def append_pandas(s,d):
import pandas as pd
df = pd.read_csv(s, sep=';', header=None)
df_t = df.T
df_t.iloc[0:1, 0:1] = 'Time Point'
df_t.columns = df_t.iloc[0]
df_new = df_t.drop(0)
pdb = pd.read_csv(d, sep=';')
newpd = pdb.append(df_new)
from pandas import DataFrame
newpd.to_csv(d, sep=';')
可以看到,有一個Time Point列,每追加一行,我想讓這一列的值加1,比如追加第一行時為0,第二行會有 1 個,第三行將有 3 個,依此類推。
你能幫忙嗎?
生成的文件如下所示:
請幫忙:(
嘗試:
df1 = pd.read_csv('data1.csv')
df2 = pd.read_csv('data2.csv', index_col=0).T
df2['Time Point'] = df1['Time Point'].iloc[-1] + 1
out = pd.concat([df1, df2], ignore_index=True)
out.to_csv('out.csv', index=False)
print(out)
# Output
Time Point A B
0 1 23 65
1 2 10 24
2 3 1 54
3 4 33 77
4 5 7 73
5 6 122 43 # <- row added with new Time Point
設置
>>> %cat data1.csv
Time Point,A,B
1,23,65
2,10,24
3,1,54
4,33,77
5,7,73
>>> %cat data2.csv
ID,Count
A,122
B,43
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