Get only fields with datatype int in PyQGIS

By type name (typeName()):

int_types = ["Integer", "Integer64"]
int_fields = [field for field in iface.activeLayer().fields() if field.typeName() in int_types]

OR by type number (type()):

int_types = [2, 4] # 2: Integer, 4: Integer64
int_fields = [field for field in iface.activeLayer().fields() if field.type() in int_types]

Type of some fields may be Integer64. Integer64 equals QVariant.LongLong actually, but it could be considered as integer.

layer = iface.activeLayer()
intfields = [f for f in layer.fields() if f.typeName().startswith('Int')]
print(intfields)

Found typeName here

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