Remember a strange Python string loss event after splicing multiple variables

There is a loss of value after stitching multiple variables in a single script run.

A = "Hello"

b = "Ketty"

c = A + B + "!"

Expected output is Hello ketty!

The actual output is!

How the script works: Python runtime plus a filename A as a parameter, the Python script runtime reads the data inside a file for parsing, the content of the a file is copied from the local Windows editor after processing the past.

Issue: When the script parses the data for a file, it will be spliced with an item at the end of each line as parameter B and other parameters. When the output string is missing, all the strings that contain the character B are lost,

The reason is that there is a problem with the Windows editor copying past data.

Workaround: Use Dos2unix A on the Linux machine, first convert the format of a file

Remember a strange Python string loss event after splicing multiple variables