How do you create different variable names while in a loop

Question

For example purposes     for x in range 0 9       string x     Hello    So I end up with string1  string2  string3    all equaling  Hello

User · Answer

I would use a list   string      for i in range 0  9     string append  Hello     This way  you would have 9  Hello  and you could get them individually like this   string x    Where x would identify which  Hello  you want   So  print string 1   would print Hello

User · Answer

for x in range 9       exec  string    str x         hello      This should work

User · Answer

Sure you can  it s called a dictionary   d      for x in range 1  10       d  string 0   format x      Hello     gt  gt  gt  d  string5    Hello   gt  gt  gt  d   string1    Hello     string2    Hello     string3    Hello     string4    Hello     string5    Hello     string6    Hello     string7    Hello     string8    Hello     string9    Hello     I said this somewhat tongue in check  but really the best way to associate one value with another value is a dictionary  That is what it was designed for

User · Answer

Using dictionaries should be right way to keep the variables and associated values  and you may use this   dict       for i in range 9        dict   string s    i      Hello    But if you want to add the variables to the local variables you can use   for i in range 9        exec  string s   Hello    i    And for example if you want to assign values 0 to 8 to them  you may use   for i in range 9        exec  string s    s     i i

User · Answer

I think the challenge here is not to call upon global    I would personally define a list for your  dynamic  variables to be held and then append to it within a for loop  Then use a separate for loop to view each entry or even execute other operations   Here is an example - I have a number of network switches  say between 2 and 8  at various BRanches  Now I need to ensure I have a way to determining how many switches are available  or alive - ping test  at any given branch and then perform some operations on them   Here is my code   import requests import sys  def switch name branchNum         s is an empty list to start with     s           this FOR loop is purely for creating and storing the dynamic variable names in s     for x in range 1 8  1           s append  BR    str branchNum     SW0    str x         this FOR loop is used to read each of the switch in list s and perform operations on     for i in s          print i   n             other operations can be executed here too for each switch  i  - like SSH in using paramiko and changing switch interface VLAN etc    def main             for example s sake - hard coding the site code     branchNum   123      switch name branchNum    if   name         main         main     Output is   BR123SW01  BR123SW02  BR123SW03  BR123SW04  BR123SW05  BR123SW06  BR123SW07

User · Answer

It s simply pointless to create variable variable names  Why     They are unnecessary  You can store everything in lists  dictionarys and so on They are hard to create  You have to use exec or globals   You can t use them  How do you write code that uses these variables  You have to use exec globals   again   Using a list is much easier     8 strings   Hello String 0      Hello String 8  strings     Hello String  d    x for x in range 9   for string in strings    you can loop over them     print string print string 6    or pick any of them

User · Answer

Don t do this use a dictionary  import sys this   sys modules   name      this is now your current namespace for x in range 0 9       setattr this   string s    x   Hello    print string0 print string1 print string2 print string3 print string4 print string5 print string6 print string7 print string8   don t do this use a dict  globals   has risk as it gives you what the namespace is currently pointing to but this can change and so modifying the return from  globals   is not a good idea

User · Answer

Dictionary can contain values and values can be added by using update   method  You want your system to create variables  so you should know where to keep   variables      break condition  True   Dont forget to add break condition to while loop if you dont want your system to go crazy  name      variable    i   0  name   name   str i   this will be your variable name  while True      value   10  value to assign     variables update                     name value       if break condition    True          break

User · Answer

One way you can do this is with exec    For example   for k in range 5       exec f cat  k    k 2      gt  gt  gt  print cat 0  0  gt  gt  gt  print cat 1  2  gt  gt  gt  print cat 2  4  gt  gt  gt  print cat 3  6  gt  gt  gt  print cat 4  8   Here I am taking advantage of the handy f string formatting in Python 3 6

User · Answer

It is really bad idea  but     for x in range 0  9       globals    string s    x     Hello    and then for example   print string3    will give you   Hello     However this is bad practice  You should use dictionaries or lists instead  as others propose  Unless  of course  you really wanted to know how to do it  but did not want to use it

[python] How do you create different variable names while in a loop?

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