如何使用python从列中的所有数据中删除最后一个字符？

Question

I have data like this in a column of a table.

RcHm_v2.0_CPg0501681
RcHm_v2.0_CPg0501691
RcHm_v2.0_CPg0501701
RcHm_v2.0_CPg0501711
RcHm_v2.0_CPg0501721
RcHm_v2.0_CPg0501731

I need to remove the last character from all these data. I have this,

for row in reader:
    transcript_id = row[1]
    gene_id = transcript_id.split(".")[0]
    row[1] = gene_id
    row[2] = gene_id
    row[16] = transcript_id
    writer.writerow(row)

From the 2nd line,

    gene_id = transcript_id.split(".")[0]

it will remove all the things after the "."(dot).(Just consider the above line of code). I need to remove the last character. I'll be grateful if someone can help me.

Thank you.

Answer 1

那么gene_id = transcript_id[:-1] ，这是一个简单的字符串切片，请阅读这篇文章。

Answer 2

gene_id = gene_id[:-1]

This will return all but the last character and reassign it to the same variable

Answer 3

If you only need to remove the last character, why are you using split?

gene_id = transcript_id[0:len(transcript_id)-1]

Here is a simple example

var1 = "Something.Else"
var2 = var2=var1[0:len(var1)-1]
print(var2)
Something.Els