str.split unintentionally strips char 'I' from the string

[Govind]

BPO	4053
Nosy	@vstinner

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2008-10-06.13:05:37.874>
created_at = <Date 2008-10-06.13:01:57.903>
labels = ['type-bug', 'library']
title = "str.split unintentionally strips char 'I' from the string"
updated_at = <Date 2008-10-06.13:05:37.860>
user = 'https://bugs.python.org/Govind'

bugs.python.org fields:

activity = <Date 2008-10-06.13:05:37.860>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2008-10-06.13:05:37.874>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2008-10-06.13:01:57.903>
creator = 'Govind'
dependencies = []
files = []
hgrepos = []
issue_num = 4053
keywords = []
message_count = 2.0
messages = ['74367', '74369']
nosy_count = 2.0
nosy_names = ['vstinner', 'Govind']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue4053'
versions = ['Python 2.5']

[Govind]

I tried to process a text file (with UTF-8 encoding) which has
contents like this:

FILE=India
asbds
FILE=Indonasia
ssgsds
FILE=Africa
DBGDGDFG

When I use the below code:
>>> f = open("e:\\temp\\file.txt", 'r')
>>> lines = f.readlines()
>>> for line in lines:
	if line.startswith("FILE="):
		print line.strip("FILE=")

I get output as:
ndia

ndonasia

Africa

I is always stripped if it follows the substring that I want to strip
off.

Am I doing something wrong here or is this a bug in Python?

-Govind

[vstinner]

Duplicate of bpo-4054.