Sine Wave Stem

import matplotlib.pyplot as plt
import numpy as np

COLORS = {
    'positive': '#10B981',
    'negative': '#EF4444',
    'background': '#FFFFFF',
    'text': '#1E293B',
    'text_muted': '#64748B',
    'grid': '#F1F5F9',
}

x = np.linspace(0, 2*np.pi, 20)
y = np.sin(x)

fig, ax = plt.subplots(figsize=(10, 5), dpi=100)
ax.set_facecolor(COLORS['background'])
fig.patch.set_facecolor(COLORS['background'])

for xi, yi in zip(x, y):
    color = COLORS['positive'] if yi >= 0 else COLORS['negative']
    ax.plot([xi, xi], [0, yi], color=color, linewidth=2, alpha=0.7, zorder=2)
    ax.scatter(xi, yi, s=100, c=color, alpha=0.2, zorder=3)
    ax.scatter(xi, yi, s=50, c=color, edgecolors='white', linewidths=1.5, zorder=4)

ax.axhline(0, color=COLORS['text'], linewidth=1, zorder=1)

ax.spines['top'].set_visible(False)
ax.spines['right'].set_visible(False)
ax.spines['left'].set_color(COLORS['grid'])
ax.spines['bottom'].set_visible(False)

ax.yaxis.grid(True, color=COLORS['grid'], linewidth=1, zorder=0)
ax.set_axisbelow(True)
ax.tick_params(axis='both', colors=COLORS['text_muted'], labelsize=9, length=0, pad=8)

ax.set_xlim(-0.3, 6.6)
ax.set_ylim(-1.3, 1.3)
ax.set_xlabel('x', fontsize=10, color=COLORS['text'], labelpad=10)
ax.set_ylabel('sin(x)', fontsize=10, color=COLORS['text'], labelpad=10)

plt.tight_layout()
plt.show()