How to switch position of two items in a Python list

Question

I haven   t been able to find a good solution for this problem on the net  probably because switch  position  list and Python are all such overloaded words    It   s rather simple      I have this list     title    email    password2    password1    first name    last name    next    newsletter     I   d like to switch position of  password2  and  password1       not knowing their exact position  only that they   re right next to one another and password2 is first   I   ve accomplished this with some rather long-winded list-subscripting  but I wondered its possible to come up with something a bit more elegant

User · Answer

The simple Python swap looks like this   foo i   foo j    foo j   foo i    Now all you need to do is figure what i is  and that can easily be done with index   i   foo index  password2

User · Answer

How can it ever be longer than  tmp   my list indexOfPwd2  my list indexOfPwd2    my list indexOfPwd2   1  my list indexOfPwd2   1    tmp   That s just a plain swap using temporary storage

User · Answer

Given your specs  I d use slice-assignment    gt  gt  gt  L     title    email    password2    password1    first name    last name    next    newsletter    gt  gt  gt  i   L index  password2    gt  gt  gt  L i i 2    L i 1 i-1 -1   gt  gt  gt  L   title    email    password1    password2    first name    last name    next    newsletter     The right-hand side of the slice assignment is a  reversed slice  and could also be spelled   L i i 2    reversed L i i 2     if you find that more readable  as many would

User · Answer

for i in range len arr        if l -1   gt  l i           l -1   l i    l i   l -1          break   as a result of this if last element is greater than element at position i then they both get swapped

User · Answer

I am not an expert in python but you could try  say   i    1 2   res   lambda i   i 1  i 0   print  res 1  2     0   format res 1  2      above would give o p as   res 1  2     2 1

User · Answer

you can use for example    gt  gt  gt  test list     title    email    password2    password1    first name                     last name    next    newsletter    gt  gt  gt  reorder func   lambda x  x insert x index  password2     x pop x index  password2   1    gt  gt  gt  reorder func test list   gt  gt  gt  test list       title    email    password1    password2    first name    last name    next    newsletter

User · Answer

i     title    email    password2    password1    first name          last name    next    newsletter   a  b   i index  password2    i index  password1   i b   i a    i a   i b

[python] How to switch position of two items in a Python list?

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