How to visualize mixed sequence alignment via PhyloTree

[Michael Gruenstaeudl]

I am looking for a way to visualize a mixed sequence alignment - comprising of DNA nucleotides as well as binary characters - as a PhyloTree object. While a sequence alignment comprising only DNA nucleotides can be visualized easily (see example 1 below), one that comprises both DNA nucleotides and binary characters cannot (see example 2 below).

```

# Example 1

from ete3 import PhyloTree

tre = "(A:3,(B:1,C:6));"
aln = """
>A
ATGC
>B
GCAT
>C
AGCT
"""
t = PhyloTree(tre, alignment=aln, alg_format="fasta")

t.show()

```

```

# Example 2 - Results in Error

from ete3 import PhyloTree

tre = "(A:3,(B:1,C:6));"
aln = """
>A
ATGC01
>B
GCAT00
>C
AGCT11
"""
t = PhyloTree(tre, alignment=aln, alg_format="fasta")

t.show()

# KeyError: '0'

```