How to get the first 2 letters of a string in Python

Question

Let s say I have a string   Str1    TN 81 NZ 0025   str2    DL 11C AA 1111  two   first2 str1  print two   gt  gt  gt TN   How do I get the first two letters of these strings  I need the first2 function for this

User · Answer

to print first two letter of a string str    quot string quot  print str 0 2

User · Answer

In general  you can the characters of a string from i until j with string i j   string  2  is shorthand for string 0 2   This works for arrays as well   Learn about python s slice notation at the official tutorial

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All previous examples will raise an exception in case your string is not long enough   Another approach is to use   yourstring  ljust 100   100  strip     This will give you first 100 chars  You might get a shorter string in case your string last chars are spaces

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It is as simple as string  2   A function can be easily written to do it  if you need    Even this  is as simple as  def first2 s       return s  2

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In python strings are list of characters  but they are not explicitly list type  just list-like  i e  it can be treated like a list   More formally  they re known as sequence  see http   docs python org 2 library stdtypes html sequence-types-str-unicode-list-tuple-bytearray-buffer-xrange     gt  gt  gt  a    foo bar   gt  gt  gt  isinstance a  list  False  gt  gt  gt  isinstance a  str  True   Since strings are sequence  you can use slicing to access parts of the list  denoted by list start index end index  see Explain Python  39 s slice notation   For example    gt  gt  gt  a    1 2 3 4   gt  gt  gt  a 0  1   first element  NOT a sequence   gt  gt  gt  a 0 1   1    a slice from first to second  a list  i e  a sequence   gt  gt  gt  a 0 2   1  2   gt  gt  gt  a  2   1  2    gt  gt  gt  x    foo bar   gt  gt  gt  x 0 2   fo   gt  gt  gt  x  2   fo    When undefined  the slice notation takes the starting position as the 0  and end position as len sequence    In the olden C days  it s an array of characters  the whole issue of dynamic vs static list sounds like legend now  see Python List vs  Array - when to use

User · Answer

t    your string    Play with the first N characters of a string with  def firstN s  n 2       return s  n    which is by default equivalent to   t  2

User · Answer

Heres what the simple function would look like   def firstTwo string       return string  2

User · Answer

For completeness  Instead of using def you could give a name to a lambda function   first2   lambda s  s  2

[python] How to get the first 2 letters of a string in Python?

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