250 lines
7.6 KiB
Python
250 lines
7.6 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf8 -*-
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# pylint: disable=W0212
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from collections import OrderedDict
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try:
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from cdecimal import Decimal
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except ImportError: # pragma: no cover
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from decimal import Decimal
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import sys
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from babel.numbers import format_decimal
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import six
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from agate.aggregations import Min, Max
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from agate import config
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from agate.data_types import Number
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from agate.exceptions import DataTypeError
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from agate import utils
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def print_bars(self, label_column_name='group', value_column_name='Count', domain=None, width=120, output=sys.stdout, printable=False):
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"""
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Print a text-based bar chart based on this table.
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:param label_column_name:
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The column containing the label values. Defaults to :code:`group`, which
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is the default output of :meth:`.Table.pivot` or :meth:`.Table.bins`.
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:param value_column_name:
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The column containing the bar values. Defaults to :code:`Count`, which
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is the default output of :meth:`.Table.pivot` or :meth:`.Table.bins`.
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:param domain:
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A 2-tuple containing the minimum and maximum values for the chart's
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x-axis. The domain must be large enough to contain all values in
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the column.
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:param width:
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The width, in characters, to use for the bar chart. Defaults to
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:code:`120`.
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:param output:
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A file-like object to print to. Defaults to :code:`sys.stdout`.
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:param printable:
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If true, only printable characters will be outputed.
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"""
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tick_mark = config.get_option('tick_char')
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horizontal_line = config.get_option('horizontal_line_char')
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locale = config.get_option('default_locale')
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if printable:
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bar_mark = config.get_option('printable_bar_char')
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zero_mark = config.get_option('printable_zero_line_char')
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else:
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bar_mark = config.get_option('bar_char')
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zero_mark = config.get_option('zero_line_char')
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y_label = label_column_name
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label_column = self._columns[label_column_name]
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# if not isinstance(label_column.data_type, Text):
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# raise ValueError('Only Text data is supported for bar chart labels.')
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x_label = value_column_name
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value_column = self._columns[value_column_name]
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if not isinstance(value_column.data_type, Number):
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raise DataTypeError('Only Number data is supported for bar chart values.')
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output = output
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width = width
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# Format numbers
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decimal_places = utils.max_precision(value_column)
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value_formatter = utils.make_number_formatter(decimal_places)
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formatted_labels = []
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for label in label_column:
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formatted_labels.append(six.text_type(label))
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formatted_values = []
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for value in value_column:
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if value is None:
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formatted_values.append('-')
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else:
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formatted_values.append(format_decimal(
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value,
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format=value_formatter,
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locale=locale
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))
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max_label_width = max(max([len(l) for l in formatted_labels]), len(y_label))
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max_value_width = max(max([len(v) for v in formatted_values]), len(x_label))
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plot_width = width - (max_label_width + max_value_width + 2)
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min_value = Min(value_column_name).run(self)
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max_value = Max(value_column_name).run(self)
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# Calculate dimensions
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if domain:
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x_min = Decimal(domain[0])
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x_max = Decimal(domain[1])
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if min_value < x_min or max_value > x_max:
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raise ValueError('Column contains values outside specified domain')
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else:
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x_min, x_max = utils.round_limits(min_value, max_value)
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# All positive
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if x_min >= 0:
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x_min = Decimal('0')
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plot_negative_width = 0
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zero_line = 0
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plot_positive_width = plot_width - 1
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# All negative
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elif x_max <= 0:
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x_max = Decimal('0')
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plot_negative_width = plot_width - 1
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zero_line = plot_width - 1
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plot_positive_width = 0
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# Mixed signs
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else:
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spread = x_max - x_min
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negative_portion = (x_min.copy_abs() / spread)
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# Subtract one for zero line
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plot_negative_width = int(((plot_width - 1) * negative_portion).to_integral_value())
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zero_line = plot_negative_width
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plot_positive_width = plot_width - (plot_negative_width + 1)
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def project(value):
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if value >= 0:
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return plot_negative_width + int((plot_positive_width * (value / x_max)).to_integral_value())
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else:
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return plot_negative_width - int((plot_negative_width * (value / x_min)).to_integral_value())
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# Calculate ticks
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ticks = OrderedDict()
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# First tick
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ticks[0] = x_min
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ticks[plot_width - 1] = x_max
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tick_fractions = [Decimal('0.25'), Decimal('0.5'), Decimal('0.75')]
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# All positive
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if x_min >= 0:
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for fraction in tick_fractions:
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value = x_max * fraction
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ticks[project(value)] = value
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# All negative
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elif x_max <= 0:
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for fraction in tick_fractions:
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value = x_min * fraction
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ticks[project(value)] = value
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# Mixed signs
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else:
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# Zero tick
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ticks[zero_line] = Decimal('0')
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# Halfway between min and 0
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value = x_min * Decimal('0.5')
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ticks[project(value)] = value
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# Halfway between 0 and max
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value = x_max * Decimal('0.5')
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ticks[project(value)] = value
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decimal_places = utils.max_precision(ticks.values())
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tick_formatter = utils.make_number_formatter(decimal_places)
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ticks_formatted = OrderedDict()
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for k, v in ticks.items():
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ticks_formatted[k] = format_decimal(
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v,
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format=tick_formatter,
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locale=locale
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)
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def write(line):
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output.write(line + '\n')
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# Chart top
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top_line = u'%s %s' % (y_label.ljust(max_label_width), x_label.rjust(max_value_width))
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write(top_line)
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# Bars
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for i, label in enumerate(formatted_labels):
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value = value_column[i]
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if value == 0 or value is None:
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bar_width = 0
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elif value > 0:
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bar_width = project(value) - plot_negative_width
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elif value < 0:
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bar_width = plot_negative_width - project(value)
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label_text = label.ljust(max_label_width)
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value_text = formatted_values[i].rjust(max_value_width)
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bar = bar_mark * bar_width
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if value is not None and value >= 0:
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gap = (u' ' * plot_negative_width)
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# All positive
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if x_min <= 0:
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bar = gap + zero_mark + bar
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else:
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bar = bar + gap + zero_mark
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else:
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bar = u' ' * (plot_negative_width - bar_width) + bar
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# All negative or mixed signs
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if value is None or x_max > value:
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bar = bar + zero_mark
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bar = bar.ljust(plot_width)
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write('%s %s %s' % (label_text, value_text, bar))
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# Axis & ticks
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axis = horizontal_line * plot_width
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tick_text = u' ' * width
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for i, (tick, label) in enumerate(ticks_formatted.items()):
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# First tick
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if tick == 0:
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offset = 0
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# Last tick
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elif tick == plot_width - 1:
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offset = -(len(label) - 1)
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else:
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offset = int(-(len(label) / 2))
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pos = (width - plot_width) + tick + offset
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# Don't print intermediate ticks that would overlap
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if tick != 0 and tick != plot_width - 1:
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if tick_text[pos - 1:pos + len(label) + 1] != ' ' * (len(label) + 2):
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continue
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tick_text = tick_text[:pos] + label + tick_text[pos + len(label):]
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axis = axis[:tick] + tick_mark + axis[tick + 1:]
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write(axis.rjust(width))
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write(tick_text)
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