How to specify location in string?

Question

I'm back to trying to remove "T" from layer names in the Drawing Order.

I have 3 layers:

T123T
12T3
T123

This will remove all the T's:

layers = act_map.listLayers()
for lyr in layers:
    if "T" in lyr.name:
        lyr.name = lyr.name.replace("T", "")

How do I specify the first position in the string? so I'm left with:

123T
12T3
123

SvenR · Accepted Answer

Try this.

layer.name is a string. So you can ask for the "T" in the first letter with ==. If this is true you change the name. But you will do this only ones. For the first letter... This is why you add the 1 in ("T","",1).

layers = act_map.listLayers()
for lyr in layers:
    if "T" == lyr.name[0]:
        lyr.name = lyr.name.replace("T", "", 1)

Luke_Pinner · Accepted Answer

You can also use the string.lstrip (left strip) method. This will remove the given character from the start of a string, leaving the string untouched if it doesn't start with that character.

layers = [l.lstrip("T") for l in act_map.listLayers()]