在字符串中输出前100个字符

Answer 1

来自python tutorial：

Degenerate slice indices are handled gracefully: an index that is too large is replaced by the string size, an upper bound smaller than the lower bound returns an empty string.

所以使用x[:100]是安全的。

Answer 2

print my_string[0:100]

Answer 3

简单：

print mystring[:100]