pyodbc cannot find driverfile for PostgreSQL (when it exists) - postgresql

Question

I have a CentOS 8 server and I try to connect to a PostgreSQL DB.
My python-file looks like
def read_df(query):
"""
Function for fetching data from the DB.
"""
con_str = (
"DRIVER={PostgreSQL};"
"DATABASE=db;"
f"UID={user};"
f"PWD={pwd};"
f"SERVER={host};"
f"PORT={port};"
)
with pyodbc.connect(con_str) as con:
df = pd.read_sql(query,con=con)
return df
and /etc/odbcinst.ini
[PostgreSQL]
Driver = /usr/lib64/psqlodbcw.so
Setup = /usr/lib64/libodbcpsqlS.so
Driver64 = /usr/lib64/psqlodbcw.so
Setup64 = /usr/lib64/libodbcpsqlS.so
the files specified above do exist:
>ls /usr/lib64 | grep psq
psqlodbcw.so
psqlodbca.so
psqlodbc.so
libodbcpsqlS.so
and I can access the file
with open("/usr/lib64/psqlodbcw.so","r") as f:
print("It works")
"It works"
but running read_df throws
File "/home/user/db_connect.py", line 192, in read_df
with pyodbc.connect(con_str) as con:
pyodbc.Error: ('01000', "[01000] [unixODBC][Driver Manager]Can't open lib '/usr/lib64/psqlodbcw.so' : file not found (0) (SQLDriverConnect)")
I can see the file also from python import os; os.listdir("/usr/lib64") - and am completely lost.
EDIT: Running ldd /usr/lib64/psqlodbcw.so yields
$ ldd /usr/lib64/psqlodbcw.so
linux-vdso.so.1 (0x00007ffce158b000)
libpq.so.5 => /lib64/libpq.so.5 (0x00007f1e90be1000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f1e909c1000)
libodbcinst.so.2 => /lib64/libodbcinst.so.2 (0x00007f1e907ab000)
libc.so.6 => /lib64/libc.so.6 (0x00007f1e903e6000)
libssl.so.1.1 => /lib64/libssl.so.1.1 (0x00007f1e90152000)
libcrypto.so.1.1 => /lib64/libcrypto.so.1.1 (0x00007f1e8fc6c000)
libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007f1e8fa17000)
libldap_r-2.4.so.2 => /lib64/libldap_r-2.4.so.2 (0x00007f1e8f7c0000)
/lib64/ld-linux-x86-64.so.2 (0x00007f1e910bb000)
libltdl.so.7 => /lib64/libltdl.so.7 (0x00007f1e8f5b6000)
libz.so.1 => /lib64/libz.so.1 (0x00007f1e8f39f000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f1e8f19b000)
libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007f1e8eeb2000)
libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007f1e8ec9b000)
libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007f1e8ea97000)
libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007f1e8e886000)
libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007f1e8e682000)
libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f1e8e46b000)
liblber-2.4.so.2 => /lib64/liblber-2.4.so.2 (0x00007f1e8e25b000)
libsasl2.so.3 => /lib64/libsasl2.so.3 (0x00007f1e8e03d000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f1e8de13000)
libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f1e8dbea000)
libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007f1e8d966000)