import sys
from PyQt4.QtGui import QTableWidget, QSizePolicy, QApplication
app = QApplication(sys.argv)
w = QTableWidget(10,10)
# p = QSizePolicy()
# p.setHorizontalPolicy(QSizePolicy.Ignored)
# w.setSizePolicy(p)
# print(w.sizePolicy().horizontalPolicy())
# print(w.width())
# print(w.frameSize())
# print(w.size())
# print(w.sizeHint())
# print(w.baseSize())
# print(w.maximumWidth())
# print(w.maximumViewportSize())
# print(w.geometry())
# print(w.normalGeometry())
# print(w.frameGeometry().width())
# w.adjustSize()
w.show()
sys.exit(app.exec_())

import sys
from PyQt4.QtGui import QTableWidget, QApplication
app = QApplication(sys.argv)
w = QTableWidget(10,10)
s = w.horizontalScrollBar()
w.show()
while s.isVisible():
    w.setFixedWidth(w.width()+1)
    
sys.exit(app.exec_())

import sys
from PyQt4.QtGui import QTableWidget, QApplication
app = QApplication(sys.argv)
w = QTableWidget(10,10)
w.show()
w.setFixedWidth(w.horizontalHeader().length() +
                w.verticalScrollBar().width() +
                w.verticalHeader().width())
sys.exit(app.exec_())