python字符串格式化

Python 2.7.12rc1 (v2.7.12rc1:13912cd1e7e8, Jun 12 2016, 05:57:31) [MSC v.1500 64 bit (AMD64)] on win32 Type "copyright", "credits" or "license()" for more information. >>> str1="i love fish" >>> str1[
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